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Defusing the Global Warming TIME BOMB BY JAMES HANSEN the consequences are potentially disastrous. would also yield a cleaner, healthier atmosphere, could slow, and eventually stop, the process COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. A paradox in the notion of human-made global warming Overview/Global Warming ■ ■ ■ ■ 70 At present, our most accurate knowledge about climate sensitivity is based on data from the earth’s history, and this evidence reveals that small forces, maintained long enough, can cause large climate change.

But it was a hell of a four days. ” On Christmas Eve a new shock isolation design for the Ebox is tested. It works, as do all three arms on the gimbal. — test, fail, rework, repeat. Within two weeks, as industry partners fly in for the last full team meeting on January 6, the robot is ready for its public unveiling before politicians and television cameras. Behind closed doors, Whittaker acknowledges that “in the last six months we’ve fallen behind a month. ” Sandstorm has graduated from a paved lot to an open field, where it now safely drives by itself at more than 30 miles an hour.

Given the present unusual global warming rate on an already warm planet, we can anticipate that areas with summer melt and rain will expand over larger areas of Greenland and fringes of Antarctica. Rising sea level itself tends to lift marine ice shelves that buttress land ice, unhinging them from anchor points. As ice shelves break up, this accelerates movement of land ice to the ocean. Although building of glaciers is slow, once an ice sheet begins to collapse, its demise can be spectacularly rapid.

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