The Earth may be approaching a tipping point due to climate change and increasing population.

A group of scientists from around the world is warning that population growth, widespread destruction of natural ecosystems, and climate change may be driving Earth toward an irreversible change in the biosphere, a planet-wide tipping point that would have destructive consequences absent adequate preparation and mitigation.


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http://www.sciencedaily.com/releases/2012/06/120606132308.htm