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January 2009

US Geological Survey Report – U.S. Climate Change Science Program. Thresholds of Climate Change in Ecosystems

By | Abrupt changes, Impacts, Shifting Ecology | No Comments

(170 pages) Ecological thresholds occur when external factors, positive feedbacks, or nonlinear instabilities in a system cause changes to propagate in a domino-like fashion that is potentially irreversible.  Atmospheric carbon dioxide has reached levels unprecedented in possibly the last 24 million years. CO2 concentrations have…

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