The Huffington Post reports that the Obama administration is seeking to enforce more regulation when it comes to mercury pollution produced by power plants, reversing the plan made by the Bush administration, which had allowed utilities to purchase emission credits instead of actually reducing emissions.

The Environmental Protection Agency added that it would instigate new regulations limiting mercury emissions from power plants, which are the leading source of mercury.

“It is yet another Bush administration policy they are not going to go forward with,” said David Bookbinder, the Sierra Club’s chief climate counsel.

The EPA will also be reviewing the Bush administration’s decision to deny California and other states the right to control emissions of cars largely responsible for global warming.