Inside the largest Earth science event: 'The time has never been more urgent'

With Trump set to have a 'chilling effect' on environmental policy, 20,000 Earth and space scientists met in California to face up to a new responsibility

They argued about moon-plasma interactions, joked about polar bears, and waxed nostalgic for sturdy sea ice.

But few of the 20,000 Earth and climate scientists meeting in San Francisco this week had much to say about the president-elect, Donald Trump - though his incoming administration loomed over much of the conference.