Nearly 200 world leaders meet in Egypt for the UN Climate Summit, COP27. Leaders are expected to discuss compensating poor countries for damages related to global warming, putting the controversial issue on the agenda for the first time since climate talks began a decade ago.
New British Prime Minister Rishi Sunak will call for a global mission for clean development when he addresses other participants later in the day.
So his predecessor Boris Johnson urged leaders not to be weak on zero emissions commitments.
The UN says progress in reducing greenhouse emissions has been woefully inadequate since the last COP 26 summit.
The planet has warmed by 1.1 degrees Celsius since the industrial age, and scientists say the increase must be limited to 1.5 degrees by 2100 to avoid the worst consequences. But according to forecasts, with current policies, growth is expected to reach 2.8 degrees this century.