In the United States, the oil and gas industry is largely responsible.With data from a satellite-mounted detector showing high methane levels over cities in India, Pakistan and Argentina, a team of scientists looked more closely to pin down the emissions sources.
High-resolution satellite images snapped in 2020 revealed the methane was coming from upwind landfills in the Argentine capital of Buenos Aires, the Indian cities of New Delhi and Mumbai, and Pakistan's second-largest city of Lahore, according to the study published on Wednesday in the journal Science Advances.
A landfill in Mumbai, for example, was putting out about 9.8 tonnes of methane per hour, or 85,000 tonnes per year, according to the study's findings. The Buenos Aires landfill emitted some 250,000 annual tonnes - or half of the city's total methane emissions. "These observations can tell us where the large methane emissions are and where mitigation action can be taken," said co-author Joannes Maasakkers, an environmental scientist at the Netherlands Institute for Space Research. Mitigation steps might include food composting or capturing the methane for biogas.PHOTO: AFP
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