redOrbit: New research is challenging the recent finding that plants could be a major source of the atmosphere’s methane levels. A study from 2006 suggested plants could account for almost half of the global production of the greenhouse gas, yet a UK-based team has found that under normal conditions, plants just convey methane from the soil to the air without actually producing it. The research suggests identifying sources of methane is key for climate control, as the gas is about 20 …