Connecticut has joined 21 other states and seven local governments this week in filing a lawsuit to block a Trump administration plan to ease carbon pollution limits at fossil-fuel-based power plants.

The petition challenges Trump’s Affordable Clean Energy, or ACE, rule, which replaces the Obama administration’s Clean Power Plan. Opponents of the new directive have labeled it the “Dirty Power Rule,” which they say rejects the science behind climate change and prolongs reliance on coal-fired power plants.