A lot of people believe that no matter what humans do to the environment, the Earth has the capability to restore its equilibrium. After all, we know that the planet has survived through many previous ice ages, periods of global warming, and eras of intense CO2 concentrations in the atmosphere. We assume that just because the Earth has recovered from these naturally occurring events, it will do so again, even as humans contribute to the environmental changes we currently observe. However, Professor Peter Sale of the United Nations University, and author of the new book Our Dying Planet…An Ecol
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