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Major efforts are underway to improve climate models both for the advancement of science and for the benefit of society. But early results could cause problems for the public understanding of climate change.

The Copenhagen Accord leaves a gap between climate impacts that can be dealt with through adaptation and those that will be avoided through mitigation. But how big is the gap?

Despite their political popularity, carbon tariffs will be next to impossible to implement effectively, and as such will do little to solve the climate problem.

For climate science, the year 2009 brought significant discoveries and startling controversies. Kurt Kleiner reports.

Controlling the climate with technology was once the stuff of science fiction. But with tests already underway, there's an urgent need for global governance of geoengineering. Mason Inman reports.

Policymakers must aim to avoid a 2 °C temperature rise, but plan to adapt to 4 °C.

Outspoken climate scientist James Hansen has just completed his first book, due for release in December. Interview by Keith Kloor.

Wetlands store vast amounts of carbon, but efforts to make them eligible for credits under a global climate treaty could prove tricky. Melanie Lenart reports.