President Obama will officially announce new EPA regulations on Monday designed to cut carbon emissions from U.S. power plants by 30 percent from 2005 levels by the year 2030, according to leaked details of the plan in recent days.

The executive move is broadly seen as the president’s way to sidestep a divided and obstructionist Congress—which has proven incapable of moving forward any climate-related legislation—by using the EPA’s legal authority to curtail emissions of greenhouse gasses in the name of public health.

So far, the most complete explanation of the proposal and the context in which it is being rolled out comes from Climate Desk‘s Tim McDonnell, who says the “rules are likely to be the biggest step toward the president’s goal of cutting US greenhouse gas emissions 17 percent by 2020.”

And Vox.com, which put together its own primer on the rules, explains:

In part based on a carbon reduction plan put forth by the National Resource Defense Council, one of the nation’s largest environmental advocay groups, the Obama plan—which EPA chief Gina McCarthy will help introduce at a press conference at 10:30 am—is being championed as “big f#%ing deal” by some despite serious and important caveats set out by others.