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Avoiding dangerous climate change is an increasingly formidable challenge. Diplomats meeting next month in Durban must propose a persuasive alternative if they are to end the Kyoto Protocol.
The human population will soon reach seven billion. Scientists must detail demographic change and its interaction with the climate at a scale that enables policymakers to plan effectively.
The Intergovernmental Panel on Climate Change must incorporate expertise outside of traditional academia in assessing knowledge on climate change, but it must be transparent in its approach.
Early warning of the Earth's tipping points will bring us closer to staving off abrupt climate change, but a societal tipping point is needed to achieve sustainability.
Those frustrated with political inertia on climate change are increasingly seeking an alternative route through the courts, but here too they are likely to see slow progress.
The Fukushima disaster sounds yet another warning call of the need for safe and clean energy sources, but the need to mitigate climate change will keep nuclear in the picture for some time yet.
Climate change presents a tremendous opportunity for discovery that will move us towards a better understanding of the physical workings of our planet and of our role as its exploiters and guardians.