US President Barack Obama is expected to unveil today what he called the "biggest, most important step we've ever taken" to fight climate change, a sensitive issue central to his legacy.
The White House will release the final version of America's Clean Power Plan, a set of environmental rules and regulations that will home in on the pollution from the nation's power plants, setting limits on power-plant carbon emissions, AFP reported.
"Power plants are the single biggest source of harmful carbon pollution that contributes to climate change," Obama said in a video released early Sunday, who made the battle against climate change a core promise of his 2008 election campaign.