The leading Democratic candidates all believe climate change is an existential threat to the planet and have vowed to bring U.S. greenhouse gas emissions down to net-zero by 2050. While the candidates have the same broad goals, they vary in their approaches. JOE BIDEN Joe Biden, former vice president under Barack Obama, touts a $1.7 trillion plan to set the United States on a course to achieve 100% clean energy and net-zero emissions by 2050. The plan calls for the installation of 500,000 electric vehicle charging stations nationwide by 2030, rejoining the United States to the Paris Climate Agreement, ending fossil fuel subsidies, and providing $400 billion for research and development in clean […]