Artificial light makes the modern world possible. But not all kinds of light are good for us. Electric light has fundamentally altered our lives, our bodies and the very nature of our sleep.
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.
Despite its deserved reputation for climate leadership, California will have to hustle to make its own long-range emissions goals.
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.