Word: emitted
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Dates: during 2010-2019
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With 270 million Americans and 4 billion people around the world using cell phones - and more signing up every day - a strong link between mobiles and cancer could have major public-health implications. As cell phones make and take calls, they emit low-level radio-frequency (RF) radiation. Stronger than FM radio signals, these RF waves are still a billionth the intensity of known carcinogenic radiation like X-rays. (See pictures from an X-ray studio...
...good news is that there are easy ways for those concerned about RF radiation to cut down on exposure. Using your cell phone's speaker or connecting a wired headset - while keeping the handset away from your body - drastically reduces RF exposure. (Bluetooth headsets help too, but they still emit some radiation.) And given the potentially more serious risks for children, who have thinner skulls than adults, parents might want to wait before handing teens their first phone - or at least ensure they use it mostly for texting...
...natural phenomenon? Scientists haven't done a good enough job of communicating how they distinguish human versus natural influences, says Hegerl. The answer lies in climate models - massive computer simulations that allow the scientists to project climate effects in various scenarios, including those in which humans do not emit any greenhouses at all. "We go out of our way to check out other explanations - by assuming it's all explained by solar activity, or by solar activity plus volcanoes, or by combinations of any of the other natural forcings known to affect climate," says Hegerl...
...change talks in Copenhagen - especially those who belonged to the U.S. delegation - singled out China as the main reason the summit nearly collapsed. Chinese diplomats fought hard against any form of emissions regulation, even though their country is now the world's No. 1 national carbon emitter, and will emit far more carbon in the future than any other. In Washington, opponents of carbon cap-and-trade also point to China, which is unlikely to take on a carbon cap of its own, and wonder why the U.S. should have to restrain its emissions. (See pictures of Beijing trying...
Stepping into Adams House's FDR Suite brings an immediate blast of warm air and the soft glow of a wood-burning fireplace. Augmenting the light of the fireplace, genuine Edison bulbs emit amber light from a turn-of-the-century chandelier. Despite the constant gray of Cambridge in February, the light streaming through the large French windows in Adams B-17 is crystal clear...