Leading climate modeler Bill Collins joined the Earth Sciences Division in April to form a new department dedicated to atmospheric and climate science. He discusses how observations show that the Earth is warming at a rate unprecedented in recent history, and that human-induced changes in atmospheric chemistry are probably the main culprits.

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[audio:http://newscenter.lbl.gov/wp-content/uploads/2008/07/sls071107collins.mp3]

TAGS: climate change, Earth sciences

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