Climate Physicists Face the Ghosts in Their Machines: Clouds

In October 2008, Chris Bretherton lifted off from the coast of northern Chile in a C-130 turboprop plane. It was too dark to see the sandy hills of the Atacama Desert below, but the darkness suited Bretherton just fine. The researcher wasn’t going sightseeing. Seated directly behind the pilots, he kept his focus entirely on the sky. The plane was stuffed with instruments, and its wings bristled…

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