He said he's certain the world is shooting past the internationally accepted threshold of limiting warming to 1.5 degrees Celsius since pre-industrial times.
Trump 2.0 will change global climate fighting efforts. Will others step up?
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“I think we have missed the 1.5 degree window,” said Jackson, who chairs the Global Carbon Project, a group of scientists who track countries’ carbon dioxide emissions.
European climate agency: This will likely be the hottest year on record -- again
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