While the developed world is starting to limit emissions of greenhouse gases, emissions
from the developing world are increasing as a result of economic growth. Reducing these
emissions while still enabling developing countries to grow requires the use of new
technologies. In most cases, these technologies are first created in high-income countries.
Thus, the challenge for climate policy is to encourage the transfer of these climate-friendly
technologies to the developing world. This policy brief reviews the economic literature on …

The first part of this paper describes results of a survey of 118 scientists. indicating at least
three different points of view about humaninduced global climate change. One point of view
generally conforms to the conclusions of the report of the Intergovernmental Panel on
Climate Change. A second perspective discounts the seriousness of the threat of global
warming. A third point of view emphasizes the uncertainties in current predictions. The
second part of the paper reviews the major conclusions of several related surveys and …

This paper studies the identification and estimation of treatment response with
heterogeneous spillovers in a network model. We generalize the standard linear-in-means
model to allow for multiple groups with between and within-group interactions. We provide a
set of identification conditions of peer effects and consider a 2SLS estimation approach.
Large sample properties of the proposed estimators are derived. Simulation experiments
show that the estimators perform well in finite samples. The model is used to study the …