A new global study has found that the number of lawsuits involving climate change has tripled since 2014, with the United States leading the way. Researchers identified 654 U.S. lawsuits—three times more than the rest of the world combined. Many of the suits, which are usually filed by individuals or nongovernmental organizations, seek to hold governments accountable for existing climate-related legal commitments. The study was done by the United Nations Environment Program and Columbia University’s Sabin Center for Climate Change Law.