Landfills are releasing large amounts of planet-warming methane gas into the atmosphere from the decomposition of waste and are a significant contributor to such emissions in urban areas, a study suggests.
August 13, 2022
Landfills are releasing large amounts of planet-warming methane gas into the atmosphere from the decomposition of waste and are a significant contributor to such emissions in urban areas, a study suggests.
Scientists used satellite data from Delhi and Mumbai in India, Lahore in Pakistan and Buenos Aires in Argentina and identified specific locations in each city that persistently emit high methane levels, all of which were landfills. The cities’ overall methane emissions from all sources were 1.4 to 2.6 times higher than previous estimates.
The study, published in Science Advances on Wednesday, is aimed at helping local governments carry out targeted efforts to limit global warming by pinpointing specific sites of major concern.
When organic waste like food, wood or paper decomposes, it emits methane into the air. Landfills are the third-largest source of methane emissions globally, after oil and gas systems and agriculture.
Although methane only accounts for about 11% of greenhouse gas emissions and lasts about a dozen years in the air, it traps 80 times more heat in the atmosphere than carbon dioxide does. Scientists estimate that at least 25% of today’s warming is driven by methane from human actions.
