Backing out of UN summit follows removal of environment minister and Alok Sharma, the Cop26 president, from cabinet.
It comes amid accusations that the agreement did not go far enough and the issue of climate change has been kicked down the road.
"You heard that disappointment on the floor," the Cop26 president said.
“This is our collective moment in history, this is our chance to forge a cleaner, healthier, more prosperous world."
COP26 was hailed as a last-gasp chance to halt the climate crisis before it destroys our way of life for good. Did it work?
Crunch talks look set to run over this evening on the final day of the climate change conference in Glasgow.
Despite the PM's "coal, cars, cash and trees" Cop26 slogan, the government only planted 4.2 million trees this year.
"This country’s politics is going to be damaged possibly beyond repair."
US congresswoman tries drink at the Cop26 summit in Glasgow: "Oh my God, love it, love it."
Prime minister on the defensive while making plea to international leaders on climate change.