the trump administration, he vowed to quadruple the help to poorer nations. south africa, a poster child for sort of environmental injustice. systems built during apartheid now, as you mentioned, so reliant on the dirtiest of fuels. this will cost many billions of dollars, split between the eu and the uk. there s more big news on the climate front today. the environmental protection agency back home is planning to propose a new rule, bill, targeting methane gas leaks. tell us how significant this development is. reporter: well, this is huge. pau because if you think of carbon dioxide as a blanket of average thickness around the planet, keeping the heat in, methane is a blanket that s as thick as an nba player is tall. it is 80 times more potent in the short term. easier to control. you can t see it or smell it unless you use a special