Discuss the significance of the December 2015 Paris Climate Pact (Agreement). It was originally signed by 195 countries, including the U.S. However, in June 2017 the U.S. declared its intended withdrawal and confirmed it in 2019, but because of the Paris Pact rules, it could not really withdraw until Nov 4, 2020 (one day after the presidential election!). How did individual states and cities counteracted the Trump administration on the subject? What did the Biden administration do in this respect and when?