A wave of bills in state legislatures across the country aim to classify climate-heating methane gas as a source of “green” or “clean” energy to prevent communities from transitioning away from fossil fuels — and secretive dark money groups connected to the gas industry are behind the effort.

The legislation could threaten the enforcement of climate policies across the country, allowing gas to stand in for clean energy in states’ renewable energy portfolios or otherwise thwarting local efforts to phase out reliance on fossil fuels. As methane emissions increasingly drive climate change, the bills would disguise the devastating environmental impacts of the powerful greenhouse gas — while the Trump administration caters to fossil fuel-backed donors on federal gas policy.

State officials say the bills are necessary to protect local economic development tied to a major local source of energy. But the legislators didn’t come up with the idea on their own: the rebrand originated from model legislation introduced by the American Legislative Exchange Council (ALEC), a conservative lobbying network funded by large corporations. And in at least one case, the effort is being pushed by the gas industry itself to further entrench states’ dependence on gas.