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A shrinking Greenland ice sheet - losing mass because of global warming - may be closer to its point of no return than previously estimated. If global average temperatures reach 1.6 degrees C (2.9 degrees F.) above preindustrial levels, the iconic ice sheet probably will tip toward irreversible loss, a new study finds. With a rise already of 0.8 degrees C, global average temperatures already are halfway there. [Source: Christian Science Monitor]
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