Climate science tells that the earth is warming as a result of human activities. But considerable uncertainty regarding the precise nature and extent of the risks remains. Economists are needed to develop sensible policies to address these risks, which account for the uncertainties.

Addressing climate change and the economic damage it will likely bring presents policymakers with a dilemma. The benefits of policy action are uncertain and would accrue largely to future generations, whereas the costs of policies run the risk of being more immediate and extensive. At the same time, the costs of inaction are irreversible, potentially catastrophic, and likely to hit poorer countries harder than developed ones.

Do the math: affordable new technologies can prevent global warming while fostering growth. March 2008

A 50% rise in global greenhouse gas emissions by 2050, higher temperatures, with more droughts and storms harming people, crops and buildings; more animal and plant species becoming extinct under expanding farmland and urban sprawl; dwindling natural resources; a billion more people living in water-stressed areas by 2030, with more pollution, disease and premature deaths ahead.

Germany continues to invest in brown coal mining, despite ambitious climate targets. Requirements for carbon capture and storage could eventually make the fuel unprofitable. March 2008