However, finance ministers felt better making public-sector spending cuts and giving money to banks via quantitative easing than priming the pump with low-carbon research or infrastructure schemes.

Now, many developed countries are back in recession, and despite more evidence about the speed of climate change, governments are still reluctant to spend money to tackle the problem. That is the story in the West — and it has led to bankruptcies, millions of people unemployed and social unrest.

But