Three major US cities being wreathed in smoke from massive wildfires now have the worst air quality of any big cities in the world, according to a monitoring group.

For the first time in a decade, more people left California last year than arrived. The realities of flooding, drought, wildfires and high costs are weighing on a weary public.

A peculiar confluence of history, legal precedent and defiance has set the stage for a regulatory mutiny in California that would reverberate throughout the country.

Climate change is "a real and present danger to California and to the people of the world," Brown said.

The agreement is different from plans expected to be announced by the Trump administration that would weaken national emissions standards.

The Natural Resources Defense Council works to safeguard the earth - its people, its plants and animals, and the natural systems on which all life depends.

Critics say the Public Utilities Commission is poised to keep emissions reductions chugging along at an unacceptably slow pace.

President Donald Trump on Monday baselessly asserted that climate change is not playing a role in the catastrophic wildfires overtaking forests across the west, rebutting an official briefing him who...

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