United Nations climate talks in Brazil have reached a subdued agreement to deliver more money to countries hit hardest by climate change to help them adapt to the wrath of extreme weather.

At the United Nations this week, four leaders showed why tackling climate change is complex.

The mood is about to shift, the hours grow longer and the already high sense of urgency somehow amp up even more as United Nations climate talks head into its final week.

U.S. climate envoy John Kerry has tested positive for COVID-19 at U.N. climate talks in Egypt.