By Margaret Munro, Postmedia News June 20, 2011
Planting trees may help appease travellers’ guilt about pumping carbon into the atmosphere. But new research suggests it will do little to cool the planet, especially when trees are planted in Canada and other northern countries, says climatologist Alvaro Montenegro, at St. Francis Xavier University in Nova Scotia.
“There is no magic bullet” for global warming, says Montenegro, “and trees are certainly not going to be providing it.”
The idea is that while tress will undoubtedly remover CO2 from the atmosphere, it will NOT lead to temperature cooling. Why? Because of the albedo effect. In Northern latitudes, as temperature rise, the ice will melt. Thus the albedo effect will lessen. Add to this the kind of trees that grow there – conifers – and the leaves will absob even more heat than the scrub it replaces would, and thins will add to global warming, not detract from it. Dr Montenegro estimates that even if we covered ALL the farming land, we would only lower the temperatures by 0..45 deg centigrade by 2100!
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