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Military and intelligence experts become increasingly focused on the “climate security” threat. Keith Kloor reports.

Climate policy should aim to limit the rate of warming, as well as setting a cap on total allowable emissions.

In their efforts to make climate information more useful for adaptation decisions, scientists will need to be clear about the limits of climate prediction.

Hopes are fading that a strong treaty will emerge from next month's negotiations in Copenhagen. Researchers who study cooperation, though, aren't surprised. Mason Inman reports.

Scientists look seriously at the possibility of warming beyond the 2 °C target. Anna Barnett reports.