India, April 29 -- Global coal mine methane (CMM) emissions remained broadly unchanged since 2021 despite rising coal production, with around 35 million tonnes (mt) of methane emitted in 2023 and 89 per cent of it left unreported in official inventories, according to a new review by energy think tank Ember.

The report, Global Coal Mine Methane Review 2026, said only 23 of 73 coal-producing countries submitted CMM data to the United Nations Framework Convention on Climate Change (UNFCCC) in 2023, leaving nearly 31 mt of emissions outside official records.

Recent disruption to the Strait of Hormuz, a critical chokepoint where 20 per cent of global oil passes through, has highlighted the fragility of fossil fuel supply chains. Yet CMM, whi...