Study says natural factors, not humans, behind West Coast warming

September 23, 2014 8:15 AM

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The rise in temperatures along the West Coast over the past century is almost entirely due to natural forces — not human emissions of greenhouse gases, according to a major new study. But that doesn’t refute the idea that humans are contributing to global climate change, the authors say.

It has been a subject of debate for years: How much has global warming contributed to a documented rise in temperatures along the West Coast?

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