The United Nations is kicking off an all-day session to prevent a warming world from reaching even more dangerous levels.
UN Secretary-General Antonio Guterres opened the Climate Action Summit on Monday by saying: "Earth is issuing a chilling cry: Stop."
Guterres told world leaders that it's not a time to negotiate but to act to make the world carbon neutral by 2050.
He wants to limit global temperature increases to a few more tenths of a degree, and he said the world can do it.
More than 60 world leaders are set to speak, kicking off with leaders from New Zealand, the hard-hit Marshall Islands, India and Germany.
The United States is not on the agenda, but a spokeswoman said President Donald Trump may pop in.
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