Word: earths
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Dates: during 2000-2009
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...water is the elixir of life, it's no wonder that Earth - which is 70% ocean - simply teems with living things. The other planets and moons in the solar system don't have it so good. They're forbidding places that are hydrological deserts, and thus biological ones...
That, at least, had long been the conventional wisdom, but in recent years, scientists have come to learn that by some measures, the solar system fairly sloshes with water. Mars, we now know, was once as wet as Earth and still harbors ice and perhaps liquid water. The moon is thought to have water locked in permafrost at its poles. Jupiter's moon Europa is probably home to a globe-girdling ocean beneath a thin rind of ice, and its Jovian sisters Callisto and Ganymede appear to be icy and wet too. Now, according to new findings by the Cassini...
America was caught off guard in the 1950s when the Soviet Union launched its first Sputnik satellite. It looks as if history may repeat itself, but this time the arena is more down to earth. In August, the leaders of Japan, China and South Korea will hold a trilateral summit to discuss how they can pool their resources and expertise to develop and commercialize emerging green technologies. Who knows what world-beating products and processes will result from a successful collaboration...
...turbines; even blue chippers like General Electric have identified wind power as a major revenue source for the future, while the construction and installation of wind turbines will employ workers here in the U.S. Investing in wind power, said President Barack Obama at a turbine factory in Iowa on Earth Day, "is a win-win. It's good for the environment; it's great for the economy." (See the top 10 green stories...
Wind-power estimates have been made before, but the PNAS team drilled them down to greater detail. Using a simulation of global wind fields from NASA's Goddard Earth Observing System Data Assimilation System - a network of complex computer systems used to simulate and predict meteorology - McElroy and his colleagues could map the distribution of wind resources around the globe, then calculate how much electricity could be produced by tapping those breezes with current turbines, which can generate about 2.5 megawatts on land, and larger turbines that can generate 3.6 megawatts offshore. (Offshore winds tend to be stronger and more...