Simple measures could raise five times more money than poorer countries are asking for, research claims

Rich countries could raise five times the money that poor countries are demanding in climate finance, through windfall taxes on fossil fuels, ending harmful subsidies and a wealth tax on billionaires, research has shown.

Developing nations are asking for at least $1tn (£750bn) a year of public funds to help them cut greenhouse gases and cope with the impacts of extreme weather.