Zero-deforestation commitments are a type of voluntary sustainability initiative that companies adopt to signal their intention to reduce or eliminate deforestation associated with commodities that they produce, trade, and/or sell. Because each company defines its own zero-deforestation commitment goals and implementation mechanisms, commitment content varies widely. This creates challenges for the assessment of commitment implementation or effectiveness.

A number of studies show that large-scale deployment of Carbon Capture and Storage (CCS) is necessary to limit the increase in global average temperature to less than 2 °C by 2100. However, some experts and citizens worry about the integrity of carbon dioxide storage sites due to the possibility of future leakage. We introduce a two-period model where two emission mitigation technologies are available to society in the first period: CCS, with a risk of carbon dioxide leakage in the second period, and a riskless mitigation alternative, such as renewable energy.

The voice and role of communities, particularly their capacity to organise and resist, has been understudied in the specialised literature on illicit crops and largely ignored in policy debates. Based on ongoing research in Colombia, this policy paper explores the capacity of communities to organise and resist – as a manifestation of cultural and social capital – in the context of illicit economies.

Globally, there is an increasing level of funding targeted to pay farmers and rural communities for the provision of ecosystem services, for example through Payments for Ecosystem or Environmental Services (PES) schemes and pilots for Reducing Emissions from Deforestation and forest Degradation, and maintaining or enhancing forest carbon stocks (REDD +). Therefore, there is growing interest in understanding the effects of economic incentives on participants' behavior and motivations.

Most of the literature on the causes of tropical deforestation has focused on the proximate and distal causes. However, research exploring the psychological drivers of deforestation, i.e., motivations, is still scant despite being crucial to understand the processes of land-use change and individual decision making within social-ecological systems. We studied the combined effect of structural and individual causes of deforestation, with particular emphasis on motivations, for a sample of rural households in Colombia’s foremost tropical deforestation frontier.

Managing natural-resource allocation and environmental externalities is a challenge. Institutional designs are central when improving water quality for downstream users, for instance, and when reallocating water quantities including for climate adaptation. Views differ on which institutions are best: states; markets; or informal institutions. For transfers of ecosystem services, we compare informal trust-based institutions to enforced contracts, both being institutional types we observe commonly in the field.

Small-scale gold mining is important to rural livelihoods in the developing world but also a source of environmental externalities. Incentives for individual producers are the classic policy response for a socially efficient balance between livelihoods and the environment. Yet monitoring individual miners is ineffective, or it is very costly, especially on frontiers with scattered small-scale miners. We ask whether monitoring at a group level effectively incentivizes cleaner artisanal mining by combining lower-cost external monitoring with local collective action.

Payments for Ecosystem Services (PES) schemes incentivise landowners to maintain, restore or enhance ecosystem services. Currently, there are more than 550 active PES programmes worldwide, expected to support conservation efforts and, ideally, to also reduce rural poverty. In this article we explore the discourses that underpin PES debates and practice in Colombia, a late-comer to the PES agenda in Latin-America. Informed by interviews with PES actors and Q-methodology (n = 41), we identify three PES discourses: conservation conduit, contextual conservation, and inconvenient conservation.

Rationing car use based on license plate number has become a popular policy in several cities around the world to address traffic congestion and air pollution. This paper studies the effects of the moderate and drastic driving restrictions imposed as part of the Pico y Placa program on car use and air pollution in Bogotá. Using data on ambient carbon monoxide, gasoline consumption, and vehicle sales and registrations, no evidence of an improvement in air quality or a reduction in car use is found in either phase of the program.