Photo taken on Jan. 20, 2021 shows the White House in Washington, D.C., the United States. U.S. President Joe Biden on Wednesday signed an executive order returning the United States to the 2015 Paris Agreement on climate change. (Photos: Xinhua)

Photo taken on Jan. 20, 2021 shows the White House in Washington, D.C., the United States. U.S. President Joe Biden on Wednesday signed an executive order returning the United States to the 2015 Paris Agreement on climate change.

Photo taken on Jan. 20, 2021 shows the White House in Washington, D.C., the United States. U.S. President Joe Biden on Wednesday signed an executive order returning the United States to the 2015 Paris Agreement on climate change.