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Washington — An environmental advocacy group backed by hedge fund tycoon Tom Steyer is set to unleash a seven-state, $100 million offensive against Republican “science deniers” this year, a no-holds-barred campaign-style push from the green billionaire that could help decide which party controls the Senate and key statehouses come November.

The Steyer-backed outside group, NextGen Climate, has billed itself as a progressive, pro-environment counterbalance to the wealthy oil and gas industry — as well as the primary foil to the pro-business Koch brothers and their well-funded conservative donor network.

The outfit, launched last year by the San Francisco billionaire, has already pledged to spend heavily this midterm year in Iowa to assist the Democratic Senate nominee Bruce Braley, and in Florida, where Gov. Rick Scott is facing a difficult re-election fight against Democrat Charlie Crist.

Steyer’s 2014 map now includes Senate races in Michigan, New Hampshire and Colorado as well as governor’s races in Maine and Pennsylvania, home to two of the most endangered Republican governors in the country, Paul LePage and Tom Corbett.

“This is the year, in our view, that we are able to demonstrate that you can use climate, you can do it well, you can do it in a smart way, to win political races,” said Chris Lehane, the longtime Democratic consultant advising Steyer.