The U.S. Environmental Protection Agency will replace Obama-era carbon and clean water regulations and open up a national debate on climate change in 2018, part of a list of priorities for the year that also includes fighting lead contamination in public drinking water.

The agenda, laid out by EPA Administrator Scott Pruitt on Tuesday, marks an extension of the agency's efforts under President Donald Trump to weaken or kill regulations the administration believes are too broad and harm economic growth, but which environmentalists say are critical to human health.

"The climate is changing. That's not the debate. The debate is how do we know what the ideal surface temperature is in 2100? ... I think the American people deserve an open honest transparent discussion about those things," said Pruitt, who has frequently cast doubt on the causes and implications of global warming.