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...species. But a new paper in the journal Biological Conservation says we may not be trying hard enough. A team of Australian researchers led by environmental scientist Lochran Traill finds that current conservation policy tends to underestimate the number of individuals needed in a population of endangered species to keep it viable. In the face of environmental fluctuation and potential disasters, says Traill, we need animal populations to number in the thousands for survival - not in the hundreds, which is what most conservationists...
...Traill and his colleagues, after reviewing the most current data, found that a better rule would be 5,000 - meaning no fewer than 5,000 adult individuals are needed to keep a species safe from the threat of extinction. Dip below that level, and any sudden change - the loss of a valued habitat, a new disease - could wipe out a species before conservationists would have time to act. "Small populations have therefore reached a point of departure: away from the ability to adapt to changing environmental circumstances and toward inflexible vulnerability to those same changes," writes Traill. (Read "Extinction 'Gene...
That's Not Entertainment Glenn Beck is a charlatan [Sept. 28]. he has made himself rich off people's fears without making the slightest constructive comment about national issues. Instead, he has spread innuendo to keep his audience happy. He's a TV evangelist who makes altar calls and then drives away in his Cadillac. Alan Moen, ENIAT, WASH...
...major story on Glenn Beck is the equivalent of giving a terrorist publicity for setting off a bomb [Sept. 28]. Beck is a charlatan: he has made himself rich off people's fears without making the slightest constructive comment about national issues. Instead, he has spread innuendo to keep his audience happy. He's a TV evangelist who makes altar calls and then drives away in his Cadillac. Alan Moen, Entiat, Wash...
...them, like the King's powerful half brother, Prince Nayef, are known for their conservative views. But as Saudi leaders try to wean the country's economy off its almost total dependence on oil, and develop new industries, they are bound to find that it makes little sense to keep half the country's human capital cooped up at home. Nor will the newly emerging class of Saudi professional women willingly go back to the way things once were. "We are not a bunch of Barbie dolls," says al-Rowaili, the Rotana television executive. "All of us have faced...