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Planting trees in snowy areas may worsen global warming as their canopies absorb sunlight which would otherwise be reflected by the snow, a study says.

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.
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