BEIJING, April 10 (Xinhuanet) -- A new study found tropical trees are better at fighting global warming than trees in higher latitudes, media reported on Tuesday.
"Our study shows that only tropical rainforests are strongly beneficial in helping slow down global warming," said study team leader Govindasamy Bala of Lawrence Livermore National Laboratory in California.
Forests affect the climate by absorbing carbon dioxide (a major greenhouse gas) to help cool the planet; by evaporating water that forms clouds, also helping to keep the planet cooler; and by absorbing sunlight with their dark leaves, which warms the Earth.
"Tropical forests are like Earth's air conditioner," said Ken Caldeira of the Carnegie Institution of Washington, Bala's colleague.
Trees in snowy places like Canada, Scandinavia and Siberia absorb sunlight that would otherwise be reflected back to space by the bright white snow.
But tropical rainforests trap larger amounts of carbon dioxide and evaporate more water to produce clouds that reflect sunlight back to space.
By simulating the effects of deforestation in different parts of the world, the study, published in the April 9 online issue of the Proceedings of the National Academy of Sciences, found deforestation in the tropics is more devastating to Earth's climate than deforestation in higher latitudes, and that trees in mid- to high-latitudes could actually cause warming.
(Agencies)
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