Just before 9 a.m., about 500 activists carrying signs that read "Protect Mother Earth" and "It Takes Roots" blocked the intersection of 3rd and Folsom streets, a block away from the Moscone Center, where the summit was behind held.
"The president likes to talk about what a great country we are", Brainard said.
However, "some folks in the US are not as eager because they don't feel it directly unless they're right next to drought or fire or floods or hurricanes or things like that", the young American scholar expressed her concern.
Over the past three days, more than 4,000 people have gathered in San Francisco for the Global Climate Action Summit (GCAS) convened by California Governor Jerry Brown to mobilize regional, local and business leaders around climate change.
"The fact that China sent a very high-level delegation to California, that was huge", said Angel Hsu, an expert on China's environmental policy at Yale. "Keeping fossil fuels in the ground will", Salazar-Lopez said.
The CEO of one of the world's largest online business software companies is urging fellow technology leaders to help fight climate change.
The U.S. Climate Alliance, which involves 17 governors, announced Thursday that it would commit to several actions, including making clean energy cheaper for consumers and promoting vehicles and transit that rely on renewable energy.
Earlier this week, Brown had said that he can't tackle climate change alone and that the issue shouldn't be a partisan one.
Scientists have warned that global greenhouse gas emissions need to peak in 2020 and then rapidly decline in order to avoid catastrophic warming.
"Cities, states, investors, and businesses are all in", Gore said.
Tokyo, Seoul and Rotterdam, meanwhile, joined Paris, London, Barcelona and Mexico City in vowing to run only electric buses by 2025.
This spirit of collaboration is in keeping with the history of San Francisco, which witnessed the signing of the UN Charter in 1945, first establishing a rules-based global order that championed multilateralism over self-interest, and endorsed progress not through conflict, but through all people working together.
Meanwhile, a growing body of research suggests that even the Paris commitments to capping rising temperatures are still too high to avoid a climate calamity.
Summit organizers say they are unaware of any US federal officials attending.
Outside the conference, hundreds of protesters said Brown could do more in California, and about a dozen briefly interrupted Bloomberg's speech with chants that natural resources were not for sale.
In response to a question Thursday at a news briefing, Brown said Trump will likely be remembered poorly when it comes to the environment.
The summit came with 2018 on pace to be the fourth hottest year on record globally.
The goal of the climate summit is to showcase actions being taken and to deepen commitments to combat climate change.
The UK is looking beyond our strong record on climate action at home. Nuttall, who served as the spokesperson of the United Nations Framework Convention on Climate Change said that he doesn't think that anyone ever thought that the achieving the Paris Agreement would be "some kind of calm sailing".