The Trump administration’s actions in recent days have cast unprecedented uncertainty upon the climate panel’s work.

Representatives of nearly 200 countries gather Monday to continue fraught negotiations on the timing and content of the UN's next blockbuster assessment of global warming science. At issue is whether the three-part assessment -- covering physical science,

The Trump administration has halted the participation of U.S. scientists in key U.N. climate change assessments, two sources familiar with the situation told Reuters, part of its broader withdrawal from climate change mitigation efforts and multilateral cooperation.