The US is back, Obama says as he takes a swipe at China and Russia

Former US president Barack Obama gives a speech during the Cop26 summit (Jane Barlow/PA)

Barack Obama has said the US is back in the fight against climate change as he took a swipe at the leaders of Russia and China for not being at Cop26.

The former US president said the US is now “moving more boldly” after fours years of “active hostility” from the administration of Donald Trump.