Approximately 80 protesters gathered and locked down the entrance to Greenpeace's San Francisco headquarters at 1661 Mission Street on Friday afternoon. The demonstration began at 2:30, and SFPD officers on the scanner are now reporting that multiple groups are protesting at the same time — perhaps in opposition to each other.

The reason is the announcement this week, praised by many in the environmentalist community, of the upcoming closure of California's last nuclear power plant, Diablo Canyon, in San Luis Obispo County. The topic of nuclear power can be divisive, though, with some environmentalists who argue that nuclear power is cleaner and less impactful than other forms of power — and that doing away with a nuclear plant only means increased use of fossil fuels.

Protester and Environmental Progress founder Mike Shellenberger posts the graph below showing that natural gas usage will likely increase as nuclear power is phased out as one of California's power sources.

March For Environmental Hope is the org behind some faction of the protest today, and they are a pro-nuclear group that has been advocating for saving Diablo Canyon.

According to this march schedule, the group will be making its way to the SF offices of the National Resources Defense Council (NRDC) at 111 Sutter Street, and will then be rallying outside PG&E headquarters around 4:15. They'll then be hopping on BART and heading out for a whole weekend of marching around Vacaville and Davis, and they plan to march in Sacramento on Tuesday.

The group produced this brief video below, in which two young mothers discuss why they believe nuclear power is good.

PG&E, in their announcement, said that Diablo Canyon produces 8 percent of California's power now, and that 8 percent will be replaced over the next nine years, before the planned 2025 closure, by renewable sources like wind and solar power. Advocates for the plants closure have also long argued that having a nuclear plant on a coastline in a seismic zone is inherently potentially disastrous, calling Diablo Canyon an American Fukushima waiting to happen.

Previously: In Triumph For Environmentalists, PG&E Says It Will Close Diablo Canyon Nuclear Plant In 2025