Washington, D.C. (April 11, 2006) β The Earth could see massive waves of species extinctions around the world if global warming continues unabated, according to a new study published in the scientific journal Conservation Biology.
Given its potential to damage areas far away from human habitation, the study finds that global warming represents one of the most pervasive threats to our planetβs biodiversity β in some areas rivaling and even surpassing deforestation as the main threat to biodiversity.
The study expands on a much-debated 2004 paper published in the journal Nature that suggested a quarter of the worldβs species would be committed to extinction by 2050 as a result of global warming. This latest study picks up where the Nature paper left off, incorporating critiques and suggestions from other scientists while increasing the global scope of the research to include diverse hotspots around the world. The results reinforce the massive species extinction risks identified in the 2004 study.
βClimate change is rapidly becoming the most serious threat to the planetβs biodiversity,β said lead author Dr. Jay Malcolm, an assistant forestry professor at the University of Toronto. βThis study provides even stronger scientific evidence that global warming will result in catastrophic species loss across the planet.β
Using vegetation models, the research is one of the first attempts to assess the potential effects of climate change on terrestrial biodiversity on a global scale rather than just looking at individual species. Scientists looked specifically at the effect that climate change would have on 25 of the 34 globally outstanding βbiodiversity hotspotsβ β areas containing a large number of species unique to these regions alone, yet facing enormous threats.
βIt isnβt just polar bears and penguins that we must worry about anymore,β said Lee Hannah, co-author of the study and senior fellow for climate change at Conservation International. βThe hotspots studied in this paper are essentially refugee camps for many of our planetβs most unique plant and animal species. If those areas are no longer habitable due to global warming then we will quite literally be destroying the last sanctuaries many of these species have left.β
Since these biodiversity hotspots make up about one percent of the Earthβs surface, but contain 44 percent of all terrestrial vertebrate species and 35 percent of the worldβs plant species, they are good indicators of the magnitude of global species that might be affected by rising CO2 levels in the atmosphere.
“These species lose their last options if we allow climate change to continue unchecked,β said Dr. Lara Hansen, Chief Climate Scientist at global conservation group WWF-World Wide Fund for Nature. βKeeping the natural wealth of this planet means we must avoid dangerous climate change β and that means we have got to reduce carbon dioxide emissions.β
Areas particularly vulnerable to climate change include the tropical Andes, the Cape Floristic region of South Africa, Southwest Australia, and the Atlantic forests of Brazil, Paraguay and Argentina.
These areas are particularly vulnerable because the species in these regions have restricted migration options due to geographical limitations. Meaning these trapped species have nowhere to go once the temperatures rise.
Borrowed from www.msn.ca