The developed world has caused climate change. But the developing world - huge and growing economies like India and China - is increasingly a big part of the problem.
Who should foot the bill for dealing with climate change? So who should pay to fix the mess? Should it be countries that have been pumping greenhouse gases into the atmosphere in ever increasing quantities since the industrial revolution, or the countries that are emitting the most now? Is it fair to penalise the developing world as it strives to catch up? Is it acceptable that rich countries be allowed to buy credits, giving them permission to pollute? And is it time to re-think our material aspirations?