Western scientists are turning their attention to methane yet again, saying it contributes as much as carbon dioxide to global warming, perhaps even more.
The warning comes in the backdrop of studies showing that the methane in atmosphere has begun to increase after a brief pause in the nineties.
What is of particular concern is that the methane production phenomenon could actually be setting off a vicious cycle.
It is like this. Methane is traced to all sorts of sources including wetlands, rice paddies, coal mines, garbage dumps, termites, even kangaroo farts!
The naturally occurring bacteria in wetlands that churn out methane become even more efficient in producing the gas as the temperature rises. Hence the concern over the recent trends.
Methane in the atmosphere had leveled off in the 1990s, so it seemed that efforts to control industrial emissions were keeping this problem gas in check. But since 2007, methane levels have been on the rise again, Richard Harris reported for the National People’s Radio.
A study published last week in
Science magazine suggests that at least part of this increase is coming from the vast wetlands in Canada, Russia and the Arctic. The methane in wetlands comes from naturally occurring bacteria. But study author Paul Palmer at the University of Edinburgh says the bacteria are producing more methane because the temperature is rising.
“This really does demonstrate the fact that we are having this vicious cycle in the climate system. And we're seeing it now."