Wind turbines are silhouetted by the setting sun near Beaumont, Kan. Kansas ranks sixth in the country in wind output, which jumped by a third last year and equalled 19 percent of the state’s electricity. In state capitals across the country, legislators are debating proposals to roll back environmental rules, prodded by industry and advocacy groups eager to curtail regulations aimed at curbing greenhouse gases. The measures, which have been introduced in about 18 states, lie at the heart of an effort to expand to the state level the battle over fossil fuel and renewable energy. The new rules would trim or abolish climate mandates — including those that require utilities to use solar and wind energy, as well as proposed Environmental Protection Agency rules that would reduce carbon emissions from power plants. But the campaign — despite its backing from powerful groups such as Americans for Prosperity — […]