The current paper offers a new explanation of the emergence of multiple equilibria, for which the high (low) income equilibrium is associated with high (low) environmental quality. This new explanation rests on endogenous technological choice in the presence of emission taxes – an idea whose foundations find strong support from existing empirical evidence. Thus, the interactions between environmental policy and technology choice, within a framework that accounts for the health effects of pollution, may suggest a possible mechanism behind some of the observed differences in income, life expectancy and environmental quality among countries.

The paper considers the transition of an economy from non-renewable to renewable energy. We set up a canonical growth model with damages in the household's welfare function and two energy sources – non-renewable and renewable energy. To produce renewable energy a capital stock must be built up. A socially optimal solution is considered that takes into account the negative externality from the non-renewable energy. We also study how the optimal solution can be mimicked in a market economy by policies using subsidies and tax rates. To solve the model numerically, we use Nonlinear Model Predictive Control. We study when a transition to renewable energy takes place and whether it occurs before the non-renewable resource is exhausted. In addition, we analyze the impact of the initial values of the non-renewable resource and of the capital stock on the time of paths of the variables.

This paper studies multilateral and unilateral policy reforms of environmental R&D subsidies and emission taxes in a two-country Cournot model with oligopolistic interdependence. The analysis indicates, inter alia, that there is a potential family of multilateral and unilateral policy reforms which can be set by pollution-intensive and pollution-moderate countries to reduce global emissions. In particular, the analysis suggests that a unilateral increase in the subsidy in the pollution-moderate country may reduce global emissions. The multilateral policy reform of the subsidy and tax in the pollution-intensive country can also reduce global emissions and increase welfare under certain conditions. The role of product differentiation in the context of policy reform is also examined.

Systematic trends in the general price level of goods and services are the subject of extensive measurement and significant interest among researchers, policy makers and the general public. Dynamic price measurement is also important in environmental accounting in that real measures of augmented output are required to draw inferences on sustainability. This paper computes price indices for emissions of five air pollutants in the United States. Using marginal damages, the paper computes Paasche, Laspeyres, Fisher and Tornquist index numbers for five air pollutants spanning the period 1999–2008 for use in computing real environmental accounts. Evidence of time series heterogeneity in the marginal damages is detected: marginal damages for nitrogen oxides increase by a factor of two and marginal damages for NH3 decrease by one-half. The analysis finds that nominal gross damages from air pollution in the United States decrease by 40 per cent between 1999 and 2008.

Non-timber forest products (NTFPs) support livelihoods in rural communities through provision of food, fuel, materials, medicines and income from sales. We estimated the contribution of NTFPs to rural household income in Zambia, and used a two-stage tobit alternative model to identify the factors associated with participation in NTFP markets. NTFPs accounted for 35 per cent of household income for participating households, second only to trading. Human capital variables and the value of assets were found to be significant determinants of both participation in business activities related to NTFPs and the associated household income, and the poor were more dependent on NTFPs than wealthier households. The effect of average rainfall underscores the role that NTFPs play in providing a safety net during periods of low crop yields. Rural development policies should recognize the role played by NTFPs in rural livelihoods and the need to balance welfare improvement and sustainable forest management.

Eco-entrepreneurs in developing countries are often subject to market or institutional constraints such as missing markets. Conservation interventions which relax constraints may be both cost effective and poverty reducing. A simulation using data from an intervention in Madagascar to relax the technological constraints of forest honey production investigates this possibility. Cost-effectively achieving dual environment-development goals is shown to depend on the severity of constraints, relative prices, along with the nature and efficiency in use of technology. Success is more likely for technologies exhibiting close to constant returns to scale or high-input complementarity. Forest honey does not meet these requirements. Ultimately, where market or institutional constraints are present, knowledge of the recipient technology is required for more informed, efficient and perhaps more politically acceptable conservation policy.