Large dairy firms have been accused of “turning a blind eye” to global methane emissions, by a report that has found a lack of clear reduction targets.

According to research into 20 major dairy brands and large coffee chains, carried out by Changing Markets, just two companies (Nestle and Danone) report reduced methane emissions.

Methane is a major driver of rapid climate heating, being 80 times more powerful than carbon dioxide. Livestock is the largest human-driven source of emissions, with around 8% down to dairy production alone.

Of the companies assessed, most lack clear methane-related targets, credible action plans or even basic transparency on emissions, finds the report. According to the data none of the firms, which dominate European and North American markets and together have combined revenues of £323bn annually, are pledging to reduce dairy product sales.

Nearly all (18 of 20 firms) scored less than half the available points. Only six (Arla, Danone, DMK, General Mills, Bel and Saputo) track their methane emissions directly, and only four disclose them.

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French food company Danone came top of the league table with 59 out of 100 points. It stands as the only firm with a methane-specific target and a plan to hit it.

US-based General Mills came second with 53.5 points, having published a climate target and plans, but not one specific to methane.

Nestlé and Arla Foods tied for third on 49 points. Nestlé was the only firm to explicitly support reduced public consumption of dairy.

Changing Markets chief executive Nusa Urbancic said: “Dairy production is a rare lever to control methane emissions, but one that firms clearly don’t want to touch.

“The near-total absence of methane-specific targets and credible action plans sends a clear signal: companies are turning a blind eye to emissions of one of the most potent and solvable drivers of global heating.”

A spokesperson for Arla told The Guardian: “Alongside our farmer owners, Arla is committed to producing more sustainable dairy and has clear science-based targets in place.”

Nestlé, Danone and General Mills have been contacted for comment.