Can we zero-in on Earth's sensitivity to CO₂?

Can we zero-in on Earth's sensitivity to CO₂?  Ars Technica Global Warming Less Likely to Be Catastrophic, Says New Nature Study  Reason (blog) Dueling Climate Change Studies and the Doubt That Surrounds Both of Them  The New American The urgency of meeting the Paris climate agreement goals  Jamaica ObserverFull coverage

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