States including Mississippi, Indiana and Texas had challenged the EPA's finding that certain areas within their borders were violating the standard.
The proposed rules have fueled political anger in the country’s heartland, becoming a top issue of concern for many farmers and landowners who say there are already too many government regulations affecting their businesses.
Indiana lawmakers say the tougher federal standards on smog-forming pollution will harm the state's economy.
Senate Bill 249, if passed into law, would ban communities from adopting an ordinance preventing the construction of livestock facilities.
The U.S. Supreme Court is stepping into a new case about Obama administration environmental rules, agreeing to review a ruling that upholds emission standards for mercury and other hazardous air pollutants from coal- and oil-fired power plants.
The stricter standards could make it one of the most expensive regulations ever issued, with an estimated $19 billion to $90 billion price tag and double the number of counties in violation.
Indianapolis' electricity utility plans to convert its aging Harding Street power plant entirely to natural gas by 2016, after facing growing pressure to do so from environmental groups and politicians.
A dozen states, led by West Virginia and including Indiana, sued the U.S. Environmental Protection Agency on Friday to block a proposed rule that would limit carbon dioxide emissions from coal-fired power plants.
The leader of Citizens Action Coalition said Indiana lawmakers put the state at a disadvantage when they passed a bill killing an energy-efficiency program that could have helped the state meet the new federal carbon-emission goal by 2030.
The plan isn’t expected to make a meaningful difference in reducing climate change, but will give President Obama evidence of America leading by example as he tries to persuade other nations to cut their carbon emissions.
Within weeks, President Barack Obama's administration is set to unveil unprecedented emissions limits on power plants across the U.S., much to the dismay of many Democratic candidates who are running for election in energy-producing states.
The 6-2 ruling was an important victory for the Obama administration in controlling emissions from power plants in 27 Midwestern and Appalachian states. Texas led 14 states, including Indiana, and industry groups in challenging the rule.
A $500,000 study paid for by the federal government and released Sunday in the peer-reviewed journal Nature Climate Change concludes that biofuels made with corn residue release 7 percent more greenhouse gases compared with conventional gasoline.
The Republican-controlled U.S. House moved Thursday to block President Barack Obama's plan to limit carbon emissions from new power plants, an election-year strike at the White House aimed at portraying Obama as a job killer.
A state senator has killed legislation that would bar Indiana environmental regulators from creating standards harsher than federal rules.