Al Gore: 'I tried my best' but Trump can't be educated on climate change

At UN climate talks in Bonn, Gore is heading an unofficial group trying to stop climate change - in the face of scepticism from Trump administration officials

Al Gore has accused Donald Trump of surrounding himself "with the absolute worst of climate deniers" and said he has given up attempting to persuade the president to reverse his dismantling of policies combatting global warming.

However, both Gore, the former US vice-president, and Jerry Brown, governor of California, told the Guardian they were confident the US will regain its leadership position on climate change if Trump is defeated in the next presidential election.