The climate policy debate has been dominated by economic estimates of the costs of policies to reduce greenhouse gas emissions. Yet the models used to derive those estimates are based on assumptions that have largely gone untested. The conventional approach embodies structural features that rule...

Climate variability in the context of climate change: El Niño and other oscillations -- Impacts of El Niño-La Niña cycles; systems and sectors -- Links to agroecosystems: processes and productivity -- Recent El Niños and their manifestations: evolving understanding -- Analysis of El Niño...