`` We are receiving a free subsidy from nature , '' said Dr. Simon Lewis from the University of Leeds , and the lead author of the paper , in a press statement . Nearly 5 billion tonnes of carbon absorbed by undisturbed tropical forests . Study found that trees in forests are getting bigger . New carbon sink discovered in Africa , study says Score: 6 IPCC says each year humans emit 32 billions tons of CO2 .
Nearly 5 billion tonnes of carbon absorbed by undisturbed tropical forests . Study found that trees in forests are getting bigger . New carbon sink discovered in Africa , study says Score: 6 IPCC says each year humans emit 32 billions tons of CO2 .