In climate change, you always have to go back to the numbers.
The scientific consensus, as far as you can pin it down, urges something in the order of a 60% cut in global greenhouse gas emissions - it would like them today, but 2050 makes a more feasible target.
Bring in considerations of equity, and for richer nations like Britain that means cuts in the order of 90%.
Sir Nicholas Stern, in his new report, broadly endorses these figures, and the overall message is clear: richer countries must cut, and cut now.
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