Stoves continuously leak small amounts of methane, emitting as much greenhouse gas as 500,000 cars put out in one year.
The same study also found that home stoves can emit high levels of nitrogen oxides, raising concerns about health and indoor air quality.
"We went into the study knowing there would be emissions when the flames were burning,... but we didn't expect to see as large a contribution from the off emissions," Rob Jackson, a Stanford University climate scientist and coauthor of the study, told CBS News.Methane is a greenhouse gas that is dozens of times more potent than carbon dioxide.
However, the EPA plans to start tracking these emissions this year, an agency spokesperson told the Washington"That's a big deal because we're trying to really reduce our carbon footprint and we claim that gas is cleaner than coal, which it is," study lead author Eric Lebel, a scientist at PSE Healthy Energy, an Oakland nonprofit, told the Associated Press. But he said much of the benefit disappears when leaks are taken into account.
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