G20: Compromise on climate change, but at what cost?

G20 countries have managed to avoid a total bust-up with Donald Trump over climate change, leaving the door open for Washington to return to the Paris Agreement -- but at the cost of risky concessions.After the US president decided last month to pull out of the hard-fought deal to combat global warming, climate change was always going to be centre-stage at this week's gathering of the G20 -- major economies that are together responsible for the vast majority of harmful emissions.Ultimately, the