Pollution

Methane levels hold steady

Levels of the greenhouse gas methane have plateaued for the first time in about 200 years, shows a report in Geophysical Research Letters. Methane is second only to carbon dioxide in contributing to our planet's warming. The gas - belched out by fossil-fuel burning, rice paddies, festering farm manure and landfill sites - has been accumulating since the industrial revolution. Now the tide may be turning, say Ed Dlugokencky of the National Oceanic and Atmospheric Administration (NOAA) in Boulder, Colorado, and his team. They found that levels steadied between 1999 and 2002, according to measurements from 43 ground-based stations around the world.
The reason for the change is unclear. Dlugokencky believes that a big contributing factor was the break-up of the Soviet Union in 1991. Oil and gas production fell, and the industry became more efficient at plugging gas leaks from pipes and wells.
Experts say the plateau is no cause for......

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Title: Pollution
Approximate Word Count: 1339
Approximate Pages: 6 (250 words per double-spaced page)

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