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Warming could wipe out half of all species PDF Print E-mail
The News - Climate-Environment
Written by Administrator   
October 25, 2007

Rising global temperatures caused by climate change could trigger a huge extinction of plants and animals, according to a study. Though humans would probably survive such an event, half of the world's species could be wiped out.

Scientists at the University of York and the University of Leeds examined the relationship between climate and biodiversity over the past 520m years - almost the entire fossil record - and uncovered an association between the two for the first time. When the Earth's temperatures are in a "greenhouse" climate phase, they found that extinctions rates were relatively high. Conversely, during cooler "icehouse" conditions, biodiversity increased.

Dr Mayhew found that of the five mass extinction events in the Earth's history, four were linked to greenhouse climates where the Earth was covered in heat-trapping carbon dioxide or methane gases. This includes the extinction of the dinosaurs 65m years ago , thought to have been caused by the impact of a large asteroid on the Yucatan peninsula and beneath the Gulf of Mexico.

The largest ever extinction occurred 251m years ago, when 95% of animal and plant species were killed off.

 Source : Guardian UK

 
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