BIO LAB deforestation presenation

BIO LAB deforestation presenation - Vivy Vu Jenny Stitt...

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Vivy Vu & Jenny Stitt Biology Lab: Deforestation Presentation September 30, 2009 TA Jamey Redding Topic : Effect of deforestation on loss of species the sixth mass extinction most scientists believe the rate of loss is greater now than at any time in the history of the Earth most scientists believe the rate of loss is greater now than at any time in the history of the Earth Dr Leakey, author of "The Sixth Extinction," believes that 50% of the earth's species will vanish within 100 years and that such a dramatic and overwhelming mass extinction threatens the entire, complex fabric of life, including Homo sapiens , (the species responsible for the crisis.) Every day , an estimated 100 plant and animal species are lost to deforestation" . . . "A conservative estimate of the current extinction rate indicates that about 27,000 species a year are being lost." National Wildlife Federation Causes of the Extinction of Species o growing size of human populations o rate at which humans consume resources and cause changing climate Global Warming and the Loss of Species o end of the Permian period, 251 million years ago o worst mass extinction in the history of the planet o six-degree C. increase in the global temperature was enough to kill up to 95 per cent of the species that were alive on Earth o called the "Great Dying." o Gigantic volcanic eruptions caused this warming by triggering a "runaway greenhouse effect" that nearly put an end to life on Earth o
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