Browsing by Author "Pfaff, Alexander"
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Item Open Access Analyzing conservation-siting decisions and spillover effects in North Carolina(2020-04-20) Jain, ShivangiLand conservation is used to protect a variety of vulnerable ecosystem services and land uses in the United States and around the world. As of 2019, 12% of the total land in the US was protected for conservation by private actors and public agencies. Strategies to select land for conservation consider a host of factors – the benefits protected by conserving land, the cost of implementing conservation, and the risk of future development if land remains unprotected. The two primary tools for conserving land, fee-simple acquisitions and conservation easements, differ in the level of protection they afford, their implementation costs, and their impact on development risk. Using data from Durham County in North Carolina, I explore how the two tools may be used to protect different types of land and how their use may have spillover effects on surrounding land values. A better understanding of the kinds of land being conserved and their spillover effects can inform future land conservation strategies for improved conservation benefits.Item Open Access Costa Rica's payment for environmental services program: intention, implementation, and impact.(Conserv Biol, 2007-10) Sánchez-Azofeifa, G Arturo; Pfaff, Alexander; Robalino, Juan Andres; Boomhower, Judson PWe evaluated the intention, implementation, and impact of Costa Rica's program of payments for environmental services (PSA), which was established in the late 1990s. Payments are given to private landowners who own land in forest areas in recognition of the ecosystem services their land provides. To characterize the distribution of PSA in Costa Rica, we combined remote sensing with geographic information system databases and then used econometrics to explore the impacts of payments on deforestation. Payments were distributed broadly across ecological and socioeconomic gradients, but the 1997-2000 deforestation rate was not significantly lower in areas that received payments. Other successful Costa Rican conservation policies, including those prior to the PSA program, may explain the current reduction in deforestation rates. The PSA program is a major advance in the global institutionalization of ecosystem investments because few, if any, other countries have such a conservation history and because much can be learned from Costa Rica's experiences.Item Open Access Durham County Homeowner Fertilizer Behaviors Survey: Summary and Analysis of Results(2013-12-02) Fleming, MorganDurham County must comply with State mandated nutrient reduction rules by 2021. Current management plans will prove costly. Residential and commercial fertilize application is not included in those current plans; however, these sources of nutrient inputs are poorly understood. Thus, a survey was administered to fill in information gaps about Durham County homeowners’ fertilizer behaviors. The two key areas of interest to the County are Best Management Practices (BMPs) and fertilizer application rates. BMP’s include sweeping impervious surfaces, not fertilizing before it rains, and not fertilizing in buffer zones for streams and lakes. 1,000 single-occupancy households were surveyed from March to April of 2013. Participants were selected randomly via a double-randomization process. The survey was administered using mixed methods. Findings indicate that few homeowners know how to determine the correct amount of fertilizer to apply to the lawn, resulting in higher risk of over-application among do-it-yourself homeowners. Mean nitrogen (N) application rates are between 1.8 and 3.1 lbs N/1,000 sqft/year, with between 1/4 and 1/2 of homeowners at risk of over-applying. While most homeowners report practicing best management practices (BMPs), misapplication due to not practicing BMPs is also a common problem. Roughly 2/3 of homeowners or their lawn care companies practice fewer than 1/2 of the BMPs they are responsible for. For both misapplication and over-application, the problems primarily seem to be knowledge-based ones and not motivation-based ones. Thus, public education may do much to correct the issues found by the survey. Please direct questions to Morgan Fleming at sspitfire1@yahoo.com with subject heading "2013 Fertilizer MEM MP Report Questions".Item Open Access ESSAYS ON GLOBAL VALUE CHAINS, POLICIES AND INEQUALITY.(2019) Carnovale, MariaThis thesis tackles development policy issues that arise when institutions have unequal power. It contributes to three fields: International Political Economy; Industrial Organization; Global Value Chain Analysis. Within this intersection I examine the institutional constraints to economic development created by global markets. I approach this question by mathematically modelling surplus distribution along Global Value Chains to simulate policy measures.
It shows that policy interventions can shift surplus shares from developing countries to advanced economies in presence of market power asymmetries. This surplus shift occurs with environmental and labor standards applied in the presence of partially-substitutable goods; and trade-based development policies . The models I develop in these papers provide a framework for further empirical investigation and policies that are better aligned with development goals.
Item Open Access Estimating the Impacts of Local Policy Innovation: The Synthetic Control Method Applied to Tropical Deforestation.(PLoS One, 2015) Sills, Erin O; Herrera, Diego; Kirkpatrick, A Justin; Brandão, Amintas; Dickson, Rebecca; Hall, Simon; Pattanayak, Subhrendu; Shoch, David; Vedoveto, Mariana; Young, Luisa; Pfaff, AlexanderQuasi-experimental methods increasingly are used to evaluate the impacts of conservation interventions by generating credible estimates of counterfactual baselines. These methods generally require large samples for statistical comparisons, presenting a challenge for evaluating innovative policies implemented within a few pioneering jurisdictions. Single jurisdictions often are studied using comparative methods, which rely on analysts' selection of best case comparisons. The synthetic control method (SCM) offers one systematic and transparent way to select cases for comparison, from a sizeable pool, by focusing upon similarity in outcomes before the intervention. We explain SCM, then apply it to one local initiative to limit deforestation in the Brazilian Amazon. The municipality of Paragominas launched a multi-pronged local initiative in 2008 to maintain low deforestation while restoring economic production. This was a response to having been placed, due to high deforestation, on a federal "blacklist" that increased enforcement of forest regulations and restricted access to credit and output markets. The local initiative included mapping and monitoring of rural land plus promotion of economic alternatives compatible with low deforestation. The key motivation for the program may have been to reduce the costs of blacklisting. However its stated purpose was to limit deforestation, and thus we apply SCM to estimate what deforestation would have been in a (counterfactual) scenario of no local initiative. We obtain a plausible estimate, in that deforestation patterns before the intervention were similar in Paragominas and the synthetic control, which suggests that after several years, the initiative did lower deforestation (significantly below the synthetic control in 2012). This demonstrates that SCM can yield helpful land-use counterfactuals for single units, with opportunities to integrate local and expert knowledge and to test innovations and permutations on policies that are implemented in just a few locations.Item Open Access Evaluating interactions of forest conservation policies on avoided deforestation.(PLoS One, 2015) Robalino, Juan; Sandoval, Catalina; Barton, David N; Chacon, Adriana; Pfaff, AlexanderWe estimate the effects on deforestation that have resulted from policy interactions between parks and payments and between park buffers and payments in Costa Rica between 2000 and 2005. We show that the characteristics of the areas where protected and unprotected lands are located differ significantly. Additionally, we find that land characteristics of each of the policies and of the places where they interact also differ significantly. To adequately estimate the effects of the policies and their interactions, we use matching methods. Matching is implemented not only to define adequate control groups, as in previous research, but also to define those groups of locations under the influence of policies that are comparable to each other. We find that it is more effective to locate parks and payments away from each other, rather than in the same location or near each other. The high levels of enforcement inside both parks and lands with payments, and the presence of conservation spillovers that reduce deforestation near parks, significantly reduce the potential impact of combining these two policies.Item Open Access Funding Nature-Based Solutions: Forestland and Water Quality Nexus(2023-04-27) Gargollo, Ana; Griffiths, TashaEcosystem services are being degraded in part due to their lack of inclusion in economic decision making. Payment for ecosystem service (PES) programs can be utilized to protect both forest land cover and its impact on water quality and flow. In the Upper Oconee River watershed in Georgia USA, such an incentive program would link forest landowner’s supply of clean water to prevented increased expenditures for local water utilities who could then use these savings to fund forestland best management practices. This project was developed through four phases, 1) Literature and Case Study Review of water-based PES programs and ecosystem valuation, 2) Interviews and surveys with Oconee stakeholders, 3) Stakeholder analysis using PMID framework, 4) Spatial analysis identifying HUC10 watersheds to prioritize in a pilot program. Key findings include a roadmap for the structure, pricing mechanism, legal instrument and stakeholder involvement design that fits the local context and ensures successful implementation.Item Open Access Global protected area impacts.(Proc Biol Sci, 2011-06-07) Joppa, Lucas N; Pfaff, AlexanderProtected areas (PAs) dominate conservation efforts. They will probably play a role in future climate policies too, as global payments may reward local reductions of loss of natural land cover. We estimate the impact of PAs on natural land cover within each of 147 countries by comparing outcomes inside PAs with outcomes outside. We use 'matching' (or 'apples to apples') for land characteristics to control for the fact that PAs very often are non-randomly distributed across their national landscapes. Protection tends towards land that, if unprotected, is less likely than average to be cleared. For 75 per cent of countries, we find protection does reduce conversion of natural land cover. However, for approximately 80 per cent of countries, our global results also confirm (following smaller-scale studies) that controlling for land characteristics reduces estimated impact by half or more. This shows the importance of controlling for at least a few key land characteristics. Further, we show that impacts vary considerably within a country (i.e. across a landscape): protection achieves less on lands far from roads, far from cities and on steeper slopes. Thus, while planners are, of course, constrained by other conservation priorities and costs, they could target higher impacts to earn more global payments for reduced deforestation.Item Open Access Golden Harmony: A study on the coexistence of artisanal and small-scale gold miners and processing plants to mitigate mercury use in Peru(2024-04-26) del Campo Farro, AlejandraThis Master’s project focuses on describing Dynacor's business model, a Canadian Mining Company operating in Peru through its subsidiary Veta Dorada, in line with the ore-selling coexistence model proposed by authors Veiga and Fadina in the paper “A review of the failed attempts to curb mercury use at artisanal gold mines and a proposed solution.” This paper is based on fieldwork carried out in December 2023 in the Arequipa Region of Peru. It describes Dynacor’s business model, identifies its strengths and attractiveness in the Artisanal and Small-Scale Mining industry, and provides recommendations for the business's long-term sustainability. This Master’s Project stemmed from Duke’s Bass Connections Impacts of Artisanal Gold Mining Project, and the fieldwork was possible thanks to Duke University’s Center for Latin American and Caribbean Studies and the Dynacor Group.Item Open Access High and far: biases in the location of protected areas.(PLoS One, 2009-12-14) Joppa, Lucas N; Pfaff, AlexanderBACKGROUND: About an eighth of the earth's land surface is in protected areas (hereafter "PAs"), most created during the 20(th) century. Natural landscapes are critical for species persistence and PAs can play a major role in conservation and in climate policy. Such contributions may be harder than expected to implement if new PAs are constrained to the same kinds of locations that PAs currently occupy. METHODOLOGY/PRINCIPAL FINDINGS: Quantitatively extending the perception that PAs occupy "rock and ice", we show that across 147 nations PA networks are biased towards places that are unlikely to face land conversion pressures even in the absence of protection. We test each country's PA network for bias in elevation, slope, distances to roads and cities, and suitability for agriculture. Further, within each country's set of PAs, we also ask if the level of protection is biased in these ways. We find that the significant majority of national PA networks are biased to higher elevations, steeper slopes and greater distances to roads and cities. Also, within a country, PAs with higher protection status are more biased than are the PAs with lower protection statuses. CONCLUSIONS/SIGNIFICANCE: In sum, PAs are biased towards where they can least prevent land conversion (even if they offer perfect protection). These globally comprehensive results extend findings from nation-level analyses. They imply that siting rules such as the Convention on Biological Diversity's 2010 Target [to protect 10% of all ecoregions] might raise PA impacts if applied at the country level. In light of the potential for global carbon-based payments for avoided deforestation or REDD, these results suggest that attention to threat could improve outcomes from the creation and management of PAs.Item Open Access Impact of Protected Areas on Forests in Madagascar(2012-04-27) Gimenez, TheoMadagascar is known for having one of the most diverse ecosystems in the world. Unfortunately, the country’s natural habitat has been declining for decades. One study estimated that only 7% of Madagascar’s original vegetation is intact. In 1927, Madagascar implemented its first Protected Areas (PAs). Prior to 2003, approximately 3% of the country’s land was protected. By 2008, this number more than tripled reaching 9.4% or just over 5.5 million hectares. Protected Areas have been used throughout the world to manage, conserve, and protect, geographic areas that would otherwise be subject to activities that could threaten their environmental and economic value. Nevertheless, few studies evaluate the effectiveness of PA networks with controls. The purpose of this study was to determine the impact Madagascar’s PAs have had on deforestation from 1990 to 2005. I use matching to make ‘apples to apples’ comparisons with respect to geographic land characteristics. A control method such as matching is essential since PAs are often non-randomly distributed. Estimates produced from matching show a .244% lower annual deforestation rate from 2000 to 2005 (.303%) than from 1990 to 2000 (.547%) in Madagascar’s PAs. Both rates are lower than naïve estimates and statistics reported in some previous studies. I also show that deforestation rates in Madagascar vary considerably with land characteristics regardless of the status of protection. This could have important implications for future forest conservation efforts since the impact of PAs vary with land characteristics as well.Item Restricted Indigenous lands, protected areas, and slowing climate change.(PLoS Biol, 2010-03-16) Ricketts, Taylor H; Soares-Filho, Britaldo; da Fonseca, Gustavo AB; Nepstad, Daniel; Pfaff, Alexander; Petsonk, Annie; Anderson, Anthony; Boucher, Doug; Cattaneo, Andrea; Conte, Marc; Creighton, Ken; Linden, Lawrence; Maretti, Claudio; Moutinho, Paulo; Ullman, Roger; Victurine, RayRecent climate talks in Copenhagen reaffirmed the crucial role of reducing emissions from deforestation and degradation (REDD). Creating and strengthening indigenous lands and other protected areas represents an effective, practical, and immediate REDD strategy that addresses both biodiversity and climate crises at once.Item Open Access Measuring protected areas’ impact on deforestation in Panama(2010-12-10) Haruna, AkikoThroughout the last century, protected areas (PAs) have been the major policy instrument for forest conservation worldwide, as well as in the Republic of Panama. The country has strived to lower the decline in its tropical forest cover which is rich in biodiversity. The importance of evaluating existing forest policies has been increasing, especially with emergence of financial incentives given to mitigation of deforestation. Few studies, however, have examined the effectiveness of forest policies in Panama, including the adoption of PAs. This study evaluates the impact of PAs on deforestation rates in Panama through the use of matching methods. The methods are used to adjust observable selection bias of PAs location. The conventional evaluation methods for protected areas failed to consider such bias, thus results using matching methods were expected to give less distorted estimates of the impact. Two types of matching methods were applied to obtain the estimated impacts of PAs, namely propensity score matching and covariate matching. The results were compared with those from the conventional evaluation methods. Countrywide forested plots in two time periods, 1992-2000, and 2000-2005 were examined. The results indicated positive effects of PAs on prevention of deforestation. They also revealed that conventional evaluation methods overestimated the impact of PAs. Such results agree with the previous matching analysis done for other geographic regions. It seems that the magnitude of the impact was enhanced in areas where high deforestation pressure existed. There was an indication of a geographical shift of deforestation frontiers toward remote areas with time. Bias-adjusted estimates for evaluation of PAs will be critical for formulation of future policy. With PAs being effective in avoiding deforestation, the future focus should be on where to put major resources for protection. As deforestation drivers make the deforestation frontier shift geographically, PAs will need to meet needs of covering forests under large threat in the present and the future.Item Open Access On the Regulation of Small Actors: Three Experimental Essays about Policies based on Voluntary Compliance and Decentralized Monitoring(2016) Rodriguez Ramirez, Luz AngelaMonitoring and enforcement are perhaps the biggest challenges in the design and implementation of environmental policies in developing countries where the actions of many small informal actors cause significant impacts on the ecosystem services and where the transaction costs for the state to regulate them could be enormous. This dissertation studies the potential of innovative institutions based on decentralized coordination and enforcement to induce better environmental outcomes. Such policies have in common that the state plays the role of providing the incentives for organization but the process of compliance happens through decentralized agreements, trust building, signaling and monitoring. I draw from the literatures in collective action, common-pool resources, game-theory and non-point source pollution to develop the instruments proposed here. To test the different conditions in which such policies could be implemented I designed two field-experiments that I conducted with small-scale gold miners in the Colombian Pacific and with users and providers of ecosystem services in the states of Veracruz, Quintana Roo and Yucatan in Mexico. This dissertation is organized in three essays.
The first essay, “Collective Incentives for Cleaner Small-Scale Gold Mining on the Frontier: Experimental Tests of Compliance with Group Incentives given Limited State Monitoring”, examines whether collective incentives, i.e. incentives provided to a group conditional on collective compliance, could “outsource” the required local monitoring, i.e. induce group interactions that extend the reach of the state that can observe only aggregate consequences in the context of small-scale gold mining. I employed a framed field-lab experiment in which the miners make decisions regarding mining intensity. The state sets a collective target for an environmental outcome, verifies compliance and provides a group reward for compliance which is split equally among members. Since the target set by the state transforms the situation into a coordination game, outcomes depend on expectations of what others will do. I conducted this experiment with 640 participants in a mining region of the Colombian Pacific and I examine different levels of policy severity and their ordering. The findings of the experiment suggest that such instruments can induce compliance but this regulation involves tradeoffs. For most severe targets – with rewards just above costs – raise gains if successful but can collapse rapidly and completely. In terms of group interactions, better outcomes are found when severity initially is lower suggesting learning.
The second essay, “Collective Compliance can be Efficient and Inequitable: Impacts of Leaders among Small-Scale Gold Miners in Colombia”, explores the channels through which communication help groups to coordinate in presence of collective incentives and whether the reached solutions are equitable or not. Also in the context of small-scale gold mining in the Colombian Pacific, I test the effect of communication in compliance with a collective environmental target. The results suggest that communication, as expected, helps to solve coordination challenges but still some groups reach agreements involving unequal outcomes. By examining the agreements that took place in each group, I observe that the main coordination mechanism was the presence of leaders that help other group members to clarify the situation. Interestingly, leaders not only helped groups to reach efficiency but also played a key role in equity by defining how the costs of compliance would be distributed among group members.
The third essay, “Creating Local PES Institutions and Increasing Impacts of PES in Mexico: A real-Time Watershed-Level Framed Field Experiment on Coordination and Conditionality”, considers the creation of a local payments for ecosystem services (PES) mechanism as an assurance game that requires the coordination between two groups of participants: upstream and downstream. Based on this assurance interaction, I explore the effect of allowing peer-sanctions on upstream behavior in the functioning of the mechanism. This field-lab experiment was implemented in three real cases of the Mexican Fondos Concurrentes (matching funds) program in the states of Veracruz, Quintana Roo and Yucatan, where 240 real users and 240 real providers of hydrological services were recruited and interacted with each other in real time. The experimental results suggest that initial trust-game behaviors align with participants’ perceptions and predicts baseline giving in assurance game. For upstream providers, i.e. those who get sanctioned, the threat and the use of sanctions increase contributions. Downstream users contribute less when offered the option to sanction – as if that option signal an uncooperative upstream – then the contributions rise in line with the complementarity in payments of the assurance game.
Item Open Access Protected Area Impacts on Land Cover in Mexico(2013-04-15) Santiago-Ávila, Francisco J.Although national and international efforts to mitigate deforestation during the last few decades have had some limited impact, they have failed to substantially slow the loss of tropical forests. This MP applies an approach for providing more evidence on what has worked or not worked in terms of conservation policies intended to reduce tropical natural land cover. Specifically, the work and approaches used in my analysis should help to illuminate the tradeoffs currently facing Mexico, a country which is seriously considering pursuing REDD policies, but also knows it would not be without economic costs. My main objective is to answer the question: "have conservation parks affected change in land cover in Mexico?” while a related objective is to assess if some types of parks have had reliably more impact. Due to the nonrandom establishment of protected areas (PAs), I employ a matching approach (propensity score) in order to construct a plausible counterfactual by controlling explicitly for land characteristics that proved to be significant drivers of both land cover change and protection status. My results indicate not only that my approach improved impact estimates, but also, in particular, that PAs lower land cover change pressure by 3.1%, and that strict protection seems to avoid more land cover change (5.3%) than loose (multi-use) protection (2.7%). While these results are suggestive, I would recommend also trying to get better and more data to test their robustness.Item Open Access Protected Area Impacts on Land Cover in Mexico(2013-04-15) SantiagoÁvila, Francisco JAlthough national and international efforts to mitigate deforestation during the last few decades have had some limited impact, they have failed to substantially slow the loss of tropical forests. This MP applies an approach for providing more evidence on what has worked or not worked in terms of conservation policies intended to reduce tropical natural land cover. Specifically, the work and approaches used in my analysis should help to illuminate the tradeoffs currently facing Mexico, a country which is seriously considering pursuing REDD policies, but also knows it would not be without economic costs. My main objective is to answer the question: "have conservation parks affected change in land cover in Mexico?” while a related objective is to assess if some types of parks have had reliably more impact. Due to the nonrandom establishment of protected areas (PAs), I employ a matching approach (propensity score) in order to construct a plausible counterfactual by controlling explicitly for land characteristics that proved to be significant drivers of both land cover change and protection status. My results indicate not only that my approach improved impact estimates, but also, in particular, that PAs lower land cover change pressure by 3.1%, and that strict protection seems to avoid more land cover change (5.3%) than loose (multi-use) protection (2.7%). While these results are suggestive, I would recommend also trying to get better and more data to test their robustness.Item Open Access Protected Areas' Impacts on Brazilian Amazon Deforestation: Examining Conservation-Development Interactions to Inform Planning.(PLoS One, 2015) Pfaff, Alexander; Robalino, Juan; Herrera, Diego; Sandoval, CatalinaProtected areas are the leading forest conservation policy for species and ecoservices goals and they may feature in climate policy if countries with tropical forest rely on familiar tools. For Brazil's Legal Amazon, we estimate the average impact of protection upon deforestation and show how protected areas' forest impacts vary significantly with development pressure. We use matching, i.e., comparisons that are apples-to-apples in observed land characteristics, to address the fact that protected areas (PAs) tend to be located on lands facing less pressure. Correcting for that location bias lowers our estimates of PAs' forest impacts by roughly half. Further, it reveals significant variation in PA impacts along development-related dimensions: for example, the PAs that are closer to roads and the PAs closer to cities have higher impact. Planners have multiple conservation and development goals, and are constrained by cost, yet still conservation planning should reflect what our results imply about future impacts of PAs.Item Open Access Protected Areas’ Deforestation Spillovers and Two Critical Underlying Mechanisms: An Empirical Exploration for the Brazilian Amazon(2015) Herrera Garcia, Luis DiegoTo date, the creation of protected areas (PAs) has been the dominant policy in the efforts to protect forests. Yet there is still somewhat limited rigorous evidence about the impacts of PAs on rates of deforestation. Further, most of the existing evidence concerns the impacts of protection within the boundaries of PAs. Much of that existing evidence does not use the characteristics of the protected lands when generating the baselines to which outcomes on protected lands are compared in order to infer the PAs' impacts. Yet even when impact within a PA has been estimated as rigorously as possible, since the total impact of protection involves impact not only inside the PA but also outside the PA even the best possible estimates of impacts within PAs could mis-state total PA impacts. Overstatements occur if there is "leakage" from PAs, i.e., spillovers of activities to forests outside PAs, so deforestation outside is higher than it would have been without the PAs.
My dissertation starts with a reduced form examination of net local spillovers. We follow this with an evaluation of two mechanisms through which PAs could affect forest nearby. In particular we explore two novel angles by considering both migration choices and road building decisions. PA creation could affect the development equilibrium by shifting private and public expectations to lower migration and road building where the PA is established, beyond the PA's boundaries. My dissertation explores implications of such thinking and provides novel empirical evidence for the Brazilian Legal Amazon.
Chapter 1 estimates deforestation spillovers around Brazilian Amazon PAs. Given PA location bias towards regions with low deforestation pressure, we use matching methods to control for observable land characteristics that may confound PAs' impacts. Specifically, we compare 2000-2004 and 2004-2008 deforestation on the land nearby to PAs with clearing of untreated forests similar in key deforestation determinants. We find that some PAs reduce deforestation rates nearby and, consistent with deforestation impacts inside PAs, those local spillovers vary across the landscape. Reductions are significant near roads and cities − not expected if the result is due to insufficient empirical controls but unsurprising if real impacts are arising due to PAs − and around an understandable subset of PAs. This result contrast sharply with most existing analyses of PAs' spillovers where, if anything, 'leakage' (higher nearby clearing) is discussed and observed. Yet we affirm a more general point that local spillovers depend on local development dynamics.
Chapter 2 examines one mechanism for the prior result that PAs lowered rates of deforestation nearby. Given migration's importance throughout the history of this forest frontier, we ask whether dissuading migration could be a mechanism for protection's local conservation spillovers. Examining individual migration decisions among the Amazon municipalities, we find that Federal PAs − previously seen to reduce rates of deforestation near PAs − seem to encourage outmigration from and discourage migration to PA areas.
Chapter 3 examines another mechanism for the result in my Chapter 1. We consider a recent expansion of the unofficial roads networks in the Brazilian Amazon to provide initial evidence concerning whether PAs may affect such investments in development. Specifically, controlling for prior roads − both official and unofficial − we test whether the growth in unofficial roads between 2008 and 2010 is reduced by establishments of PAs. Thus, we examine road growth as another potential mechanism for forest spillovers from PAs. Controlling for relevant observable factors, and using both matching and OLS, we find that having a large fraction of municipal area in PAs − in particular Federal PAs − reduces the growth of unofficial roads. Such impacts can significantly influence regional development patterns.
Item Unknown Reducing Costs to Compliance with Falls Lake and Jordan Lake Rules(2013-12-16) Fleming, MorganDurham County Manager’s Office should consider a combination of an education campaign, a business license and one or more fertilizer ordinances to try to reduce the amount of nitrogen and phosphorus pollution coming from lawn fertilizer application. The education campaign will help increase homeowner knowledge and awareness around proper fertilizer application. The business license will double as a certification program for commercial applicators, ensuring the applicators are well informed of County policy and applicable guidelines. The fertilizer ordinances will give added weight to the messages conveyed in the education and certification programs by codifying the most important practices in law.Item Open Access Reduction in urinary arsenic levels in response to arsenic mitigation efforts in Araihazar, Bangladesh.(Environ Health Perspect, 2007-06) Chen, Yu; van Geen, Alexander; Graziano, Joseph H; Pfaff, Alexander; Madajewicz, Malgosia; Parvez, Faruque; Hussain, AZM Iftekhar; Slavkovich, Vesna; Islam, Tariqul; Ahsan, HabibulBACKGROUND: There is a need to identify and evaluate an effective mitigation program for arsenic exposure from drinking water in Bangladesh. OBJECTIVE: We evaluated the effectiveness of a multifaceted mitigation program to reduce As exposure among 11,746 individuals in a prospective cohort study initiated in 2000 in Araihazar, Bangladesh, by interviewing participants and measuring changes in urinary As levels. METHODS: The interventions included a) person-to-person reporting of well test results and health education; b) well labeling and village-level health education; and c) installations of 50 deep, low-As community wells in villages with the highest As exposure. RESULTS: Two years after these interventions, 58% of the 6,512 participants with unsafe wells (As >/=50 microg) at baseline had responded by switching to other wells. Well labeling and village-level health education was positively related to switching to safe wells (As < 50 mug/L) among participants with unsafe wells [rate ratio (RR) = 1.84; 95% confidence interval (CI), 1.60-2.11] and inversely related to any well switching among those with safe wells (RR = 0.80; 95% CI, 0.66-0.98). The urinary As level in participants who switched to a well identified as safe (< 50 microg As/L) dropped from an average of 375 microg As/g creatinine to 200 microg As/g creatinine, a 46% reduction toward the average urinary As content of 136 microg As/g creatinine for participants that used safe wells throughout. Urinary As reduction was positively related to educational attainment, body mass index, never-smoking, absence of skin lesions, and time since switching (p for trend < 0.05). CONCLUSIONS: Our study shows that testing of wells and informing households of the consequences of As exposure, combined with installation of deep community wells where most needed, can effectively address the continuing public health emergency from arsenic in drinking water in Bangladesh.