Setbacks in Congress and at the Supreme Court are putting President Joe Biden's climate change goals out of reach as brutal heatwaves descend on much of the U.S. and Europe.
The former presidential hopeful, secretary of State and senator will try to convince reluctant nations to take stronger action to fight climate change — even as his own country makes only halting progress.
Democrats and scientists say the U.S. needs to dramatically lower the pollution driving climate change, while Republicans say that will harm the economy.
