See Candidate Page Joe Biden, Clean Energy, Climate Biden tweets 9/4/19 On day one as president, Joe Biden will take action to put the United States on track to achieve a 100% clean energy economy and net-zero emissions no later than 2050Because action on climate change can’t wait. #ClimateTownHall pic.twitter.com/YWw0tFodt2— Joe Biden (@JoeBiden) September 5, 2019