Pressure on wealthy governments to stop financing polluting coal projects in developing nations is getting results, with more countries expected to announce this week and in coming months that they will no longer provide money for coal.

But the battle is far from won — and is now shifting to include oil and gas finance, climate change campaigners say.

Britain has led the way among major donors, saying it would provide no new government financing for fossil fuel projects overseas from this month, with "very limited" exceptions.