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Amazon Rainforest Under Threat
The study, which led scientists to come up with the new theory, identifies a link between reducing sulphur dioxide emissions from burning coal and increasing sea surface temperatures in the tropical north Atlantic, resulting in a heightened risk of drought in the Amazon rainforest.
The Amazon rainforest contains about one tenth of the total carbon stored in land ecosystems and recycles a large fraction of the rainfall that falls upon it. So any major change to its vegetation, brought about by events like deforestation or drought, has an impact on the global climate system.
A team from the University of Exeter, Centre for Ecology and Hydrology, Met Office Hadley Centre and Brazilian National Institute for Space Studies used the Met Office Hadley Centre climate-carbon model to simulate the impacts of twenty-first century climate change on the Amazon rainforest.
They compared the model to data from the 2005 drought, which caused widespread devastation across the Amazon basin.
The researchers estimate that by 2025, a drought on this scale could happen every other year and by 2060, a drought could occur in nine out of every ten years.
Sulphate aerosol particles arising from the burning of coal in power stations in the 1970s and 1980s have partially reduced global warming by reflecting sunlight and making clouds brighter.
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