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In page Fugitive emission:

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A detailed inventory of greenhouse gas emissions from upstream oil and gas activities in Canada for the year 2000 estimated that fugitive equipment leaks had a global warming potential equivalent to the release of 17 million metric tonnes of carbon dioxide, or 12 percent of all greenhouse gases emitted by the sector,[1] while another report put fugitive emissions at 5.2% of world greenhouse emissions in 2013.[2] Venting of natural gas, flaring, accidental releases and storage losses accounted for an additional 38 percent.[citation needed]