Landfill, oil and gas industries top methane emissions league

New official estimates of the UK's methane emissions show a 28% increase on last year's figures. Landfill sites are now thought to be the single largest source of the greenhouse gas. But most of the increase comes from a 400% rise in estimated emissions from offshore oil and gas production.

Methane is the second most important greenhouse gas after carbon dioxide, and its atmospheric concentration is rising at a rate of 1% per year. Emission inventories of the gas are still uncertain, as the major changes between last year's and this year's estimates in the Department of the Environment's annual statistical digest suggest (see table ).

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