Word: underlying
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Dates: during 2000-2000
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In just three or four decades, we had managed to reverse one of nature's most remarkable geomorphological phenomena. By the 1980s coastal Louisiana, instead of expanding in size, was disappearing under the Gulf at a rate of nearly 40 sq. mi. (100 sq km) a year. (The rate of...
Unfortunately, no simple solution is politically simple. There's usually fierce resistance from local stakeholders to any proposal to remove a dam, no matter how small. But it's striking how, in just two or three decades, the U.S. has gone from building dams to not building dams to taking...
Ideally, the hydrogen would be produced sustainably with renewable electricity from the sun or wind. But even under the most optimistic predictions for improvements in renewable technology, the electricity required to split H2O into H and O would be prohibitively expensive. So the first large-scale plants will probably wrest...
The principal cause of both extinction and the slowing of evolution is the degrading and destruction of habitats by human action. While covering only 6% of Earth's land surface, about the same as the 48 contiguous United States, the rain forests are losing an area about half the size...
To be sure, this kind of success is uneven. For every region in the world that has brought its population under control, there's another where things are still exploding. For every country that has figured out the art of sustainable agriculture, there are others that have worked their land...