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Dr David Schimel, a researcher at Nasa's Jet Propulsion Laboratory in California, who led the study, said: 'This is good news, because uptake in boreal forests is already slowing, while tropical forests may continue to take up carbon for many years.' However, Dr Schimel and his colleagues warn that deforestation in tropical rainforests could exacerbate climate change by leaving more carbon dioxide in the atmosphere. In total, they estimate that forests and other vegetation absorb around 2.7 billion tonnes of carbon dioxide, about 30 per cent of that emitted by humans.