A study says planting trees in snowy areas isn't a good idea to combat global warming:
The report in US journal Proceedings of the National Academy of Sciences says the pine forests of Europe, Siberia and Canada may contribute to warming.
Only tropical forests effectively cool the earth by absorbing carbon dioxide and creating clouds, the report says.
But the report's authors stress they are not advocating chopping down trees.
They say forests are a valuable resource and remain vital for bio-diversity, providing a home for animals and plants.
Scientists have long argued that planting and preserving forests helps reduce global warming because trees absorb carbon dioxide from the atmosphere and convert it to oxygen.
Trees also absorb water from the ground, helping to form clouds that shield the earth from sunlight.
But the report's findings, discussed last year at an American Geophysical Union meeting and now published in the Proceedings of the National Academy of Sciences, suggest planting forests indiscriminately may be counter-productive.
"Our new study shows that only tropical rainforests are strongly beneficial in helping slow down global warming," Govindasamy Bala of the Lawrence Livermore National Laboratory says.
In cooler areas of the earth, tree cover helps store sunlight reflected by snow on the ground and this "cancels or exceeds" the net cooling effect, Mr Bala told the AFP news agency.
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Re: Planting trees in snowy areas increases global warming by Anonymous on Saturday, April 14 2007 @ 14:40:47 CEST
I believe the largest contributor to global warming is the amount of hot air being released from the mouths of all the "experts"!