US dropped the environmental ball under Trump, but Biden victory means the two countries can work together for a green recovery, says campaigner

Ma Jun experienced a strange role reversal during Donald Trump’s presidency. Over more than two decades as one of China’s top environmental campaigners, American encouragement for Beijing to cut carbon emissions and temper the damage of rapid industrialisation had been part of the background music. Ma never imagined he would see the US renege on environmental commitments while China began to face up to the challenge.

“It’s been frustrating,” says Ma of the past four years as we speak on the phone, the bustle of Beijing audible in the background. “When it comes to environmental collaboration between the governments, it has been hard to do anything.”