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Aubrey Meyer of the London-based Global Commons Institute has proposed an international solution – ‘Contraction and Convergence’ (C&C). This proposal recognizes that the only realistic way to avoid global political stalemate is to accept the need for equity – that each person has an equal right to the use of the atmosphere. At the moment, the wide divergence in carbon footprints means that each American is using nearly twenty times as much atmospheric space as each Indian. By demanding that India makes cuts at the same time as the US, the American government is in effect proposing to cement this inequity – something the Indian government is understandably unwilling to sign up to.

C&C gets around this problem by putting in place a framework for ‘convergence’ to equity where, by a negotiable date (say, 2030), each country in the world will have an equal emissions entitlement based on its population. While all of our carbon footprints might not be the same by that date, our rights would be.

So people in rich countries who want to use more than their fair share would have to pay for the right to do so by buying unused allocations from people in poorer countries. The result would likely be a net transfer of wealth from rich to poor, which would help tackle global poverty at the same time as global warming. This wouldn’t be charity, but trade – something world leaders are more likely to sign up to.

Of course, convergence is only one half of the equation. The other would be ‘contraction’, where global emissions contract downwards towards a sustainable level that would avoid serious climate change damages.

So far, C&C has gained substantial support from the African group of nations, while in the UK it has been recommended by the Royal Commission on Environmental Pollution and the Archbishop of Canterbury. Aubrey Meyer suggests that C&C could provide a stronger framework for climate change action once the Kyoto Protocol lapses in 2012.