A major step by US to tackle climate change

The final rules propose to reduce carbon emissions from power plants by 32% (against previous target of 30%) of 2005 level by 2030.
The states will have to submit final plans by 2018 (instead of 2017) and comply by 2022 (instead of 2020).
Until now there were no federal limits on the amount of pollution coal fired plants could produce.
These plants provide 37% of power supply and 40% of emissions.
The move has got mixed response with Republicans voicing opposition, saying they would be economically damaging.