Trade negotiators in Brussels are proposing new loopholes on a G20 pledge to phase out fossil fuel subsidies within a decade, in the latest leaked TTIP proposals seen by the Guardian.

The EU’s draft text for a trade and sustainable development chapter also appears to draw an equivalence between the need to prevent trade distortions and the fight against climate change.

The leak will provide fresh ammunition to critics of the Transatlantic Trade and Investment Partnership (TTIP) free trade deal, who fear that its provisions could undermine hard-won climate commitments.

One of these was a pledge in May to phase out inefficient fossil fuel subsidies by 2025 – which currently run at $10m (£7.5m) a minute – by G7 ministers at a summit in Japan.

The EU’s proposal will be discussed in a 14th round of TTIP negotiations currently underway in Brussels. It says that both the EU and US share the goal of phasing out such subsidies, where this “encourages wasteful consumption”.

But “such a phasing out may take into account security of supply considerations and be accompanied by measures to alleviate the social consequences associated with the phasing out,” the proposal says.