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An evangelical Christian, married to a pastor, living in conservative west Texas, and widely regarded as a top-notch climate scientist, Dr. Katharine Hayhoe is a rare breed on paper -- in person, she's even rarer.
The latest Intergovernmental Panel on Climate Change report finds that stabilizing at 2°C (3.6°F) reduces the median annual growth of consumption over this century by a mere 0.06%. You read that right, 0.06%. And that "cost" doesn't even count the economic benefit of avoiding climate catastrophe.