Thousands of protesters challenge Democratic governor at climate summit

Activists attempted to barricade entrance at the summit and criticized Jerry Brown for allowing over 20,000 drilling operations

California's status as a progressive bastion on climate change action has been challenged by activists who attempted to barricade the way to a major summit in San Francisco and decried the oil and gas drilling they say is blighting the health of low-income and minority communities.

Related: Climate change activists defy Trump's inaction with their own summit