Soot from Stoves: possibly easy to fix cheaply?

[amborin]

KOHLUA, India —

“It’s hard to believe that this is what’s melting the glaciers,” said Dr. Veerabhadran Ramanathan, one of the world’s leading climate scientists

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As women in ragged saris of a thousand hues bake bread and stew lentils in the early evening over fires fueled by twigs and dung, children cough from the dense smoke that fills their homes. Black grime coats the undersides of thatched roofs. At dawn, a brown cloud stretches over the landscape like a diaphanous dirty blanket.

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While carbon dioxide may be the No. 1 contributor to rising global temperatures, scientists say, black carbon has emerged as an important No. 2, with recent studies estimating that it is responsible for 18 percent of the planet’s warming, compared with 40 percent for carbon dioxide.

Decreasing black carbon emissions would be a relatively cheap way to significantly rein in global warming — especially in the short term, climate experts say.

Replacing primitive cooking stoves with modern versions that emit far less soot could provide a much-needed stopgap, while nations struggle with the more difficult task of enacting programs and developing technologies to curb carbon dioxide emissions from fossil fuels.

In fact, reducing black carbon is one of a number of relatively quick and simple climate fixes using existing technologies — often called “low hanging fruit” — that scientists say should be plucked immediately to avert the worst projected consequences of global warming.

“It is clear to any person who cares about climate change that this will have a huge impact on the global environment,” said Dr. Ramanathan, a professor of climate science at the Scripps Institute of Oceanography, who is working with the Energy and Resources Institute in New Delhi on a project to help poor families acquire new stoves.

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Better still, decreasing soot could have a rapid effect. Unlike carbon dioxide, which lingers in the atmosphere for years, soot stays there for a few weeks. Converting to low-soot cookstoves would remove the warming effects of black carbon quickly, while shutting a coal plant takes years to substantially reduce global CO2 concentrations.

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Like tiny heat-absorbing black sweaters, soot particles warm the air and melt the ice by absorbing the sun’s heat when they settle on glaciers. One recent study estimated that black carbon might account for as much as half of Arctic warming.

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...in March, a bill was introduced in Congress that would require the Environmental Protection Agency to specifically regulate black carbon and direct aid to black carbon reduction projects abroad, including introducing cookstoves in 20 million homes.

The new stoves cost about $20 and use solar power or are more efficient. Soot is reduced by more than 90 percent. The solar stoves do not use wood or dung. Other new stoves simply burn fuel more cleanly, generally by pulverizing the fuel first and adding a small fan that improves combustion.

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Still, replacing hundreds of millions of cookstoves — the source of heat, food and sterile water — is not a simple matter.

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She would like a stove that “made less smoke and used less fuel” but cannot afford one, she said, pushing a dung cake bought for one rupee into the fire.

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In March, the cookstove project, called Surya, began “market testing” six alternative cookers in villages, in part to quantify their benefits. Already, the researchers fret that the new stoves look like scientific instruments and are fragile; one broke when a villager pushed twigs in too hard.

But if black carbon is ever to be addressed on a large scale, acceptance of the new stoves is crucial.

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<http://www.nytimes.com/2009/04/16/science/earth/16degrees.html?hpw>