The Obama administration’s big new move on climate policy would cut climate pollution from power plants by 30 percent over the next 16 years, with the biggest reduction coming from coal-fired plants. But opponents promise a fight on many fronts.The Obama administration’s big new move on climate policy would cut climate pollution from power plants by 30 percent over the next 16 years, with the biggest reduction coming from coal-fired plants. But opponents promise a fight on many fronts.