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 When the noted biologist E.O. Wilson spoke on the University of Nebraska campus a few years ago, he noted that we are now in the middle of 'The Sixth Extinction'. Not since the end of the dinosaurs has the earth seen so many species vanish so quickly. This time, though, the problem is caused by man. Species go extinct for a variety of reasons. Disease such as avian cholera spreads from snow geese to whooping cranes cramped together in ever-decreasing wetlands. Houston's suburban sprawl has reduced the Attwater's prairie-chicken to just one final booming ground near Texas City. Many Hawaiian plants have been exterminated by introduced, non-native species too formidable to compete with. Without a reduction in the amount of human activity on the planet, as much as 25% of all species will fade into oblivion in our lifetimes. As much as 50% of the diversity of life on Earth could be lost by the year 2100. |
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