Abstract: The illegal exploitation of wild abalone in South Africa has been escalating since 1994, despite increased enforcement, leading to collapse in some sections of its range. South Africa banned all wild abalone fishing in 2008 but controversially reopened it in 2010. This paper formulates a poacher’s model, taking into account the realities of the abalone terrain in South Africa—the prevalence of bribery, corruption, use of recreational drugs, and the high value of abalone—to explore why poaching has not subsided. The paper suggests two additional measures that might help ameliorate the situation: eliminating the demand side through enforcement targeted on organized crime, and ceding the resource to the local coastal communities. However, local communities need to be empowered to deal with organised crime groups. Complementary measures to bring back community patriotism will also be needed given the tattered social fabric of the local coastal communities.

Abstract: Presently, the mountain gorilla in Rwanda, Uganda, and the Democratic Republic of Congo is endangered mainly by poaching and habitat loss. This paper sets out to investigate the possible resolution of poaching involving the local community by using benefit sharing schemes with local communities. Using a bioeconomic model, the paper demonstrates that the current revenue sharing scheme yields suboptimal conservation outcomes. It is shown, however, that a performance-linked benefit sharing scheme in which the Park Agency makes payment to the local community based on the growth of the gorilla stock can achieve socially optimal conservation. This scheme renders unnecessary poaching effort by the local community. Therefore, it becomes unnecessary to impose poaching fines and anti-poaching enforcement on the local community. Given the huge financial outlay requirements for the ideal benefit sharing scheme, the Park Agencies in Central Africa could reap more financial benefits for use in conservation if they employ an oligopolistic pricing strategy for gorilla tourism.

Abstract: The restitution of parkland to the Khomani San “bushmen” and Mier “agricultural” communities in May 2002 marked a significant shift in conservation in the Kgalagadi Transfrontier Park and environs in South Africa. Biodiversity conservation will benefit from this land restitution only if the Khomani San, who interact with nature more than do other groups, are good environmental stewards. To assess their attitude toward biodiversity conservation, this study used the contingent valuation method to investigate the values the communities assign to biodiversity conservation under three land tenure arrangements in the Kgalagadi area. For each community and land tenure arrangement, there are winners and losers, but the winners benefit by more than the cost that losers suffer. The net worth for biodiversity conservation under the various land tenure regimes ranged from R928 to R3,456 to R4,160 for municipal land, parkland, and communal land respectively for the Khomani San, compared to R25,600 to R57,600 to R64,000 for municipal land, parkland, and communal land respectively for the Mier. Both communities have the highest preference for the implementation of the biodiversity conservation programme on communal land. There are no significant differences in the WTP between the two communities when adjusted for annual median household income; hence, the Khomani San can be trusted to become good environmental stewards. However, in order for all members of the local communities to support biodiversity conservation unconditionally, mechanisms for fair distribution of the associated costs and benefits should be put in place.

Abstract: Deforestation and forest degradation are estimated to account for between 12 percent and 20 percent of annual greenhouse gas emissions. These activities, largely in the developing world, released about 5.8 Gt per year in the 1990s, which was more than all forms of transport combined. The idea behind REDD+ is that payments for sequestering carbon can tip the economic balance away from loss of forests and in the process yield climate benefits. Recent analysis has suggested that developing country carbon sequestration can effectively compete with other climate investments as part of a cost-effective climate policy. This paper focuses on opportunities and complications associated with bringing community-controlled forests into REDD+. About 25 percent of developing country forests are community controlled; therefore, it is difficult to envision a successful REDD+ program without coming to terms with community controlled forests. It is widely agreed that REDD+ offers opportunities to bring value to developing country forests, but there are also concerns related to insecure and poorly defined community forest tenure, informed by often long histories of government unwillingness to meaningfully devolve ownership rights to communities. Further, because communities are complicated systems, there is also concern that REDD+ could destabilize existing well-functioning community forestry systems.

Abstract: Namibian hake is the most important fish resource in Namibia. This monograph is a compilation of all the hake data, historic and recent, that has been used to inform stock assessment and management since the late 1970s. It presents the statistical catch-at-age analysis used to evaluate the state of the Namibian hake resource under different assumptions. This analysis treats the two hakes, Merluccius paradoxus and M. capensis, as a single stock. The data and modeling show that the stock has not as yet recovered to its maximum sustainable yield level, despite foreign fishing effort having been removed in 1990. Best estimates suggest the current stock to be roughly 20% of pre-exploitation levels; however this figure is sensitive to model assumptions. Signs indicate that the stock is slowly recovering from its all-time low in 2002-2004. Because the two hake species are pooled for assessment, the resource is currently managed on a relatively simple adaptive basis; 80% of the estimated replacement yield is reserved for fishing, the remainder being left for rebuilding.

Abstract: Using the land tenure system in Ethiopia, where all land is state-owned and only farm households have usufruct rights, as a case study, we assessed the links between land owners’ tenure insecurity, associated behavioral factors, and contract length. In this paper, we analyze these links with survey data of rural households in the Amhara National Regional State of Ethiopia. The empirical strategy follows a hazard function model employed in duration data analyses and investigates the fitness of the data to the alternative exponential and Weibull functional forms. The results show that landlords’ risk aversion increases the duration of contracts, which is in line with the reverse tenancy argument that landlords’ risk preferences affect land-contract decisions. The findings of the study also indicate that tenure insecurity is a critical factor in the nature and length of contracts; hence, policies should aim to reduce landlords’ frustrations regarding future land redistribution by the state. An important implication of the results is that secure tenure systems can reduce the disincentives from tenure insecurity due to uncertainty about contract duration and thereby enhance tenants’ welfare. Longer-term and stable contracts can improve the land rental market. In addition, the impact of risk preferences points toward the importance of poverty in the functioning of the land rental market.

Abstract: The new fertilizer subsidies in sub-Saharan Africa are intended to increase agricultural production and ensure development of a fertilizer market. Fertilizer adoption requires complementary inputs, such as investment in soil and water conservation (SWC), for efficient and optimal nutrient uptake, and many fertilizer subsidy programs implicitly assume that fertilizer subsidies crowd in such investments. The results of our study of the impact of fertilizer subsidies on SWC efforts in Ghana indicate that beneficiaries of the program do not invest significantly more in SWC. This suggests that policies should not expect farmers to respond to fertilizer subsidies with substantial investment in SWC. Thus, in order to achieve increased investment in SWC for sustainable agricultural development, more comprehensive measures that include fertilizer investments explicitly (such as integrated soil fertility management programs) may be needed.

Abstract: Typically both local villagers (“insiders”) and non-locals (“outsiders”) extract products from protected forests even though the activities are illegal. Our paper suggests that, depending on the relative ecological damage caused by each group, budget-constrained forest managers may be able to reduce total forest degradation by legalizing “insider” extraction in return for local villagers involvement in enforcement activities. We illustrate this through the development of a game-theoretic model that considers explicitly the interaction between the forest manager who can combine a limited enforcement budget with legalization of insider resource extraction and livelihood projects such as bee keeping, insider villagers, and outsider charcoal producers.

Abstract: Cities in developing countries experiencing rapid urbanization and population growth too often lack the financial resources and institutional capacity to provide needed municipal infrastructure for adequate solid waste management, despite citizens’ demand for it. This paper uses a cross-sectional survey of 226 randomly selected households in Mekelle City, Ethiopia, to assess the current municipal sanitation fees and the willingness to pay (WTP) of residents for improved urban waste management, and suggests mechanisms for cost recovery. We used Tobit and probit models in the empirical analysis to determine the factors that influence households’ WTP for improved solid waste management. Results reveal that residents’ WTP for improved solid waste management is significantly related to income and awareness of environmental quality, among other factors. Study results reveal that the current city fee for sanitation is far below the WTP of the residents. The mean WTP we found can be a guide for municipal officials in setting a more appropriate fee that can finance improvements in city SWM, where all households receive collection services, waste is disposed of properly, and recycling and composting features are added.

Abstract: Although Marine Protected Areas (MPAs) provide an increasingly popular policy tool for protecting marine stocks and biodiversity, they pose high costs for small-scale fisherfolk who have few alternative livelihood options in poor countries. MPAs often address this burden on local households by providing some benefits to compensate locals and/or induce compliance with restrictions. We argue that MPAs in poor countries can only contribute to sustainability if management induces changes in resource-dependent households‘ incentives to fish. With Tanzania‘s Mnazi Bay Ruvuma Estuary Marine Park (MBREMP) and its internal villages as an example, we use an economic decision modeling framework as a lens to examine incentives, reaction to incentives, and implications for sustainable MPA management created by park managers‘ use of enforcement ("sticks") and livelihood projects ("carrots"). We emphasize practical implementation issues faced by MBREMP managers and implications for fostering marine ecosystem sustainability in a poor country setting.

Abstract: This study uses survey data from randomly selected rural households in Ethiopia to examine the coping mechanisms employed by rural households to deal with fuelwood scarcity. The determinants ofcollecting other biomass energy sources were also examined. The results of the empirical analysis show that rural households in forest-degraded areas respond to fuelwood shortages by increasing their labor input for fuelwood collection. However, for households in high forest cover regions, forest stock and forest access may be more important factors than scarcity of fuelwood in determining household‘s labor input to collect it. The study also finds that there is limited evidence of substitution between fuelwood anddung, or fuelwood and crop residue. Therefore, supply-side strategies alone may not be effective in addressing the problem of forest degradation and biodiversity loss. Any policy on natural resource management, especially related to rural energy, should distinguish regions with different levels of forest degradation.

Abstract: Soil fertility depletion is considered the main biophysical limiting factor to increasing per capita food production for most smallholder farmers in Africa. The adoption and diffusion of sustainable agricultural practices (SAPs), as a way to tackle this impediment, has become an important issue in the development policy agenda for sub-Saharan Africa. This paper examines the adoption decisions for SAPs, using multiple crosssectional plot-level observations, collected in 2010 from 681 farm households and 1,539 plots, in 4 districts and 88 villages of rural Tanzania. We employ a multivariate probit technique to model simultaneous adoption decisions by farm households. Our study reveals that rainfall shocks, insects and disease shocks, government effectiveness, tenure status of plot, social capital, plot location and size, and asset ownership, all influence the adoption decision of sustainable practices. Policies that target SAPs and are aimed at organizing farmers into associations, improving land tenure security, and enhancing skills of civil servants can increase the likelihoodthat smallholder farmers will adopt SAPs.

Abstract: This paper studies the patterns of farmers’ crop choices for a multiple-crop portfolio, where production risk considerations and rainfall uncertainty are likely to be critical factors. Our analysisemploys plot-level panel data from Ethiopia, combined with seasonal and yearly rainfall variability (from 30 years of meteorological data corresponding to the survey villages). Using the single indexapproach, our results indicate that the combined riskiness of crop portfolios at a household level responds negatively to annual rainfall variability, while seasonal rainfall variability has less consistent impact. Farmers are more likely to select less risky crops with less return, even when intercrop interactions are taken into account. Moreover, development policies designed to enhance accumulation and risk taking should take into account the importance of such exogenous factors as weather in ex-ante risk taking.

Abstract: This study looked into tree-growing behavior of rural households in Ethiopia. With data collected at household and parcel levels from the four major regions of Ethiopia, we analyzed the decision to grow trees and the number of trees grown, using such econometric strategies as a zero-inflated negative binomial model, Heckman’s two-step procedure, and panel data techniques. Our findings show the importance of analysis at the parcel level in addition to the more common household-level. Moreover, the empirical analysis indicates that the determinants of the decision to grow trees are not necessarily the same as those involved in deciding the number of trees grown. Land certification, as an indicator of tenure security, increases the likelihood that households will grow trees, but is not a significant determinant of the number of trees grown. Other variables, such as risk aversion, land size, adult male labor, and education of household head, also influence the number of trees grown. In general, the results suggest the need to use education and/or awareness of the role and importance of trees and point out the importance of household endowments and behavior, such as land, labor, and risk aversion, for tree growing. Finally, we observed that, while tree planting is practiced in all four regions covered,there are variations across regions.

Abstract: With contingent valuation, both the goods being valued and the payment vehicles used to value them are mostly hypothetical. However, although numerous studies have examined the impact ofexperience with the good on willingness to pay, less attention has been given to experience with payment vehicles. This paper examines how this influences responses to a contingent valuation scenarioof maintenance for irrigation canals. Specifically, the paper uses a split-sample survey to investigate the effects of experience with monetary and labor payment vehicles on the acceptance of a contingentvaluation scenario and protest bids. Using convergent validity tests, we found that experience acquired from using both monetary and labor payment vehicles reduces the asymmetries in acceptance rates. These findings suggest that experience with payment vehicles reduces time/money response asymmetries in the contingent valuation method.

Abstract: This paper analyses the economic impacts of climate change on Ethiopia’s agriculture using a countrywide computable general equilibrium model. The impacts on agriculture are based on results from a Ricardian model where current (and future) agricultural production is analyzed as a function of temperature and precipitation. We project that the effect of overall climate change will be relatively benign until approximately 2030 and then worsen considerably. Our simulation results indicate that, over a 50-year period, the projected reduction in agricultural productivity may lead to 30 percent less average income, compared with the possible outcome in the absence of climate change. Autonomous adaptations that the farmers make and government policies in response will be crucial for Ethiopia’s future development.

Abstract: Fiscal instruments are potentially among the most effective, and cost-effective, options for addressing externalities related to poor air quality, urban road congestion, and greenhouse gases. This paper takes a case study, focused on Mauritius (a pioneer in the use of green taxes) to illustrate how existing taxes, especially on fuels and vehicles, could be reformed to better address these externalities. We discuss, in particular, an explicit carbon tax; a variety of options for reforming vehicle taxes to meet environmental, equity, and revenue objectives; and a progressive transition to usage-based vehicle taxes to address congestion.

Abstract: This paper uses data from household- and plot-level surveys conducted in the highlands of the Tigray and Amhara regions of Ethiopia to examine the contribution of sustainable land-management practices to net values of agricultural production in areas with low- and high-agricultural potential. A combination of parametricand nonparametric estimation techniques is used to check result robustness. Both techniques consistently predict that minimum tillage is superior to commercial fertilizers—as are farmers’ traditional practices without use of commercial fertilizers—in enhancing crop productivity in the low-agricultural potential areas. In the highagricultural potential areas, by contrast, use of commercial fertilizers is superior to both minimum tillage andfarmers’ traditional practices without commercial fertilizers. The results are found to be insensitive to hidden bias. Our findings imply a need for careful agroecological targeting when developing, promoting, and scaling up sustainable land-management practices.

Abstract: We used 2008 DHS data sets to construct child height- and weight-for-age Z-scores and used regression analysis to analyze the effects of different sources of drinking water and sanitation on child health outcomes in Nigeria. We also calculated the probability of a child being stunted or underweight as our measure of malnutrition among children aged 0–59 months. Our results show that both child height and weight Z-scores are positive and significantly related to access to borehole and piped water, and negative and significant for well water. The probabilities of a child being stunted or underweight are both significantly lower for children drinking borehole or piped water, whereas well water has a positive and significant effect on these measures of child health.Children’s access to flush toilets is positive and significantly related to child height- and weight-for-age Z-scores, but the same measures are negatively related to children’s use of pit latrines. In line with this, the probability of a child being stunted or underweight is negative and significantly related to access to flush toilets, but positively related to pit latrines. Our results suggest that increasing access to, or providing, safe drinking water and flush toilets for households will significantly reduce the high incidence of malnutrition and water-borne diseases among children in Nigeria and should be a high priority for policymakers.

Abstract: The importance of providing secure land rights to smallholder farmers in developing countries is now widely recognized. In line with this, our paper analyzes the impact of land certification on boosting productivity of female-headed households in Ethiopia, which are believed to be systematically more tenure insecure than their male counterparts. Based on parametric and semi-parametric analyses, the impact of certification on plot-level productivity is positive and significant. However, certification has different impacts on male and female productivity: male-headed households gain significantly and women gain only modestly. Hence, the results indicate that, while certification is clearly beneficial to farm-level productivity, it does not necessarily lead to more gains for female-headed households.