State Senator Darrell Steinberg is proposing a carbon tax on gasoline that would put a price on the pollution that causes climate change. The plan would also dismantle a key piece of California's existing climate law.
Without adopting more aggressive tactics, the state will not meet its 2050 goal to reduce emissions by 80 percent from 1990 levels.
Three new monitors to measure vehicle emissions are going up this year at congested traffic corridors in the Bay Area.
President Obama is introducing a plan to cut greenhouse gas emissions from power plants and support more renewable energy development.