You can watch highlights of Day One of the climate change summit here.
This video is from Cities4Climate and focuses on more sustainable cities.
San Francisco is hosting a worldwide collection of states, cities and regional governments that have pledged to do their part to help meet the goals set in the landmark 2015 Paris agreement on climate change despite opposition from the White House. There are 222 governments in the coalition, which its leader says covers more than 43% of the global economy and 1.3 billion people. The attendees Wednesday included 72 premiers, governors and other senior leaders.