Meanwhile, July 3 was the hottest day ever recorded globally.
A lot is riding on this international conference in Egypt.
Shadow climate change secretary criticised the idea of the PM being "a leader on clean energy".
Graham Stuart said Rishi Sunak's decision to attend the climate summit in Egypt was not driven by Boris Johnson saying he would go.
It's not just Rishi Sunak's attendance which is in question.
Backing out of UN summit follows removal of environment minister and Alok Sharma, the Cop26 president, from cabinet.