The Obama administration has released strong new rules targeting coal-burning power plants in an effort to curb global warming.
The 645-page rule is a centrepiece of President Barack Obama's plans to leverage similar commitments other polluting nations like China and India.
States must submit initial compliance plans by June 2016.
The rules seek to reduce carbon emissions by 30% below 2005 levels, which the EPA says is equal to the emissions from powering more than half the homes in the U.S. for one year.
