Before the hockey stick...

...there was the curve. It's coincidental that this week sees both the 50th anniversary of the Keeling Curve and the meeting in Bali to discuss the successor to Kyoto. In terms of science meets policy, it represents a kind of long term cause and effect. It's where research into human impact on the atmosphere started, and led to the birth of the Intergovernmental Panel on Climate Change.

The Keeling Curve (actually more of a sawtooth upward slope than a curve) started in 1957 shows rising carbon dioxide levels in the atmosphere.

Whereas Kyoto has failed to deliver a reduction in CO2 emissions, the Keeling Curve is still here and rising, as stark a reminder as ever.