29 Jan '12, 2am

Are the World's Big Trees Doomed? | Care2 Causes

Are the World's Big Trees Doomed? | Care2 Causes

The existence of some of the “largest organisms that have ever lived ” – 3,000-year-old sequoias , the 2,000-year-old giant redwoods , big trees around the world in Amazonia, Africa and central America — is in danger as never before, says New Scientist magazine . We human beings who build roads, farms and settlements are certainly to blame . But longer and more extreme droughts and the introduction of new pests and diseases are also contributing to big trees’s demise with repercussions for the climate. When older trees die, forests “release their stored carbon, prompting a vicious circle of further warming and forest shrinkage,” says William Laurance , a research professor at James Cook University in Cairns, Australia. Big trees comprise only 2 percent of any forest’s trees but they are crucial to their ecosystem as they provide a quarter of the biomass and also seed large...

Full article: http://www.care2.com/causes/are-the-worlds-big-trees-doom...

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