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SAN FRANCISCO A mantra that has driven global negotiations on carbon dioxide emissions for years has been that policy-makers must prevent warming of more than two degrees Celsius to prevent apocalyptic climate outcomes. And, two degrees has been a point of no return, a limit directly or indirectly agreed to by negotiators at international climate talks. James Hansen, director of the NASA Goddard Institute for Space Studies in New York, whose data since the 1980s has been central to setting that benchmark, said today that two degrees is too much.

A major government report says that the rate of excess weight and obesity among children ages two to five have doubled since the 1980s. Michelle Miller takes a look at what's being done to stop the trend.

By Philip Ball The idea that neglected environments encourage crime and antisocial behavior has been around since the 1980s. [More]