Rishi Sunak urged world leaders at the UN climate summit in Egypt to "summon the collective will" to cap a global rise in temperatures in a speech criticised by campaigners for lacking substance.
Mr Sunak, who became Prime Minister late last month, had initially said he would be too busy coming up with a plan to fix Britain's economy to attend the COP27 summit, drawing criticism from political opponents and campaigners.
Speaking to delegates in Sharm el-Sheikh tonight, he said the pandemic "all but broke" the global economy and Putin's "abhorrent war in Ukraine and rising energy prices across the world are not a reason to go slow on climate change.