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JARRATT, Va. (AP) — A man convicted of killing a family of four, slashing their throats and setting their home ablaze after they left their front door open while preparing for a New Year's Day party in 2006, was executed Wednesday.
Of the many things that keep climate scientists awake at night, tipping points may be the scariest. To start with, these thresholds for deep, sometimes catastrophic change in the complex web of Earth's natural forces, caused by man-made global warming, are largely invisible. "There are points-of-no-return where, for example, a certain amount of warming triggers unstoppable collapse of glaciers off of Antarctica, even if the planet cools again," explained Ben Strauss, vice president of the US research group Climate Central.