WASHINGTON (AP) — Setting his sights on Republicans who reject climate change, an environmentalist billionaire is unveiling plans to spend $100 million this year in seven competitive Senate and gubernatorial races, as his super PAC works to counteract a flood of conservative spending by the Koch brothers.

NextGen Climate Action said it plans to spend at least $50 million contributed by founder Tom Steyer, a retired hedge fund manager and longtime Democratic donor, and another $50 million the group is seeking to raise from likeminded donors. The money will be used to back Democrats and attack Republicans running for Senate in New Hampshire, Iowa, Colorado and Michigan, and for governor in Pennsylvania, Florida and Maine.

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