An international team of scientists has released data indicating that greenhouse gas uptake（摄取，领会） by continents is less than previously¹ thought because of methane² emissions⁴ from freshwater areas. John Downing, an Iowa State University professor in the ecology, evolution and organismal biology department, is part of an international team that concluded that methane release from inland waters is higher than previous estimates.

The study, published in the journal Science, indicates that methane gas release from freshwater areas changes the net absorption of greenhouse gases by natural continental⁵ environments, such as forests, by at least 25 percent. Past analyses of carbon and greenhouse gas exchanges on continents failed to account for the methane gas that is naturally released from lakes and running water.

Downing, a laboratory limnologist（湖泊学家） at Iowa State, has also conducted research measuring the amount of carbon sequestered⁶ in lake and pond sediment⁷（沉淀物） . This new study gives scientists a better understanding of the balance between carbon sequestration and greenhouse gas releases from fresh water bodies.

"Methane is a greenhouse gas that is more potent⁸ than carbon dioxide in the global change scenario," Downing said. "The bottom line is that we have uncovered an important accounting⁹ error in the global carbon budget. Acre for acre, lakes, ponds, rivers and streams are many times more active in carbon processing than seas or land surfaces, so they need to be included in global carbon budgets."

Methane emissions from lakes and running water occur naturally, but have been difficult to assess. David Bastviken, principal author and professor in the department of water and environmental studies, at Linköping University in Sweden, said small methane emissions from the surfaces of water bodies occur continuously.

"Greater emissions occur suddenly and with irregular timing¹⁰, when methane bubbles from the sediment reach the atmosphere, and such fluxes¹¹ have been difficult to measure," Bastviken said.

The greenhouse effect is caused by human emission³ of gasses that act like a blanket and trap heat inside the Earth's atmosphere, according to the International Panel on Climate Change. Some ecosystems¹², such as forests can absorb and store greenhouse gasses. The balance between emissions and uptake determine how climate will change. The role of freshwater environments has been unclear in previous budgets, Downing said.