Grattan Institute calls on Labor to set policies that will further reduce the use of gas in order to meet net zero targets

• Sign up for climate and environment editor Adam Morton’s free Clear Air newsletter here

After more than a half a century of growth, the use of gas in Australia has peaked in all sectors and entered a “structural decline”. But use will need to fall fast to meet climate targets, according to new research from an influential thinktank.

The Grattan Institute warned the government had failed to acknowledge the decline and instead needed policies to further reduce gas use and avoid the need for expensive carbon capture technologies to meet net zero targets.

Sign up to get climate and environment editor Adam Morton’s Clear Air column as a free newsletter

Outrage as leaked documents reveal mining giant’s backsliding on commitments to slash emissions

• Adam Morton: Big Mining gets a $4bn tax break to use fossil fuel. It’s a strange way to tackle emissions

• Read more from the BHP files investigation here

• Get our breaking news email, free app or daily news podcast

The independent senator David Pocock says leaked BHP documents show that the mining giant is “laughing” at Australia’s key climate policy while pocketing hundreds of millions of dollars through a generous diesel tax break.

An exclusive investigation based on documents leaked to by the Guardian and the ABC show BHP has scrapped a project to significantly reduce global emissions, delayed vast renewables projects in the Pilbara and war-gamed options to push the electrification of its polluting diesel truck and train fleets into the next two decades.