Environmental Protection Agency chief Gina McCarthyGina McCarthyCongress should investigate cancer collusion Obama won’t weaken car emissions standards Overnight Energy: Rough hearing for Tillerson MORE said the administration's signature climate change regulation is "changing the tone" of conversations with global leaders.
"We know the U.S. has to really go out domestically and take serious action," McCarthy said on a call with reporters Monday previewing public hearings this week on the new carbon emissions standards.
But McCarthy said, if the administration didn't push the new standards, which the mandate states cut carbon dioxide from existing power plants 30 percent by 2030, then "a global solution to climate change won't make it to the table."
She added that the new rules are "internationally changing the tone of the conversation."
"We have already seen a different tone in the diplomatic talks the State Department is having," McCarthy said, referring to Secretary of State John Kerry's climate push with countries such as China and India.
When asked about the fallout from Australia's repeal of its carbon tax heading into the Paris 2015 talks, McCarthy said Australia is just "one factor."
"There are many players at the table now talking very seriously," she added. "We need to change the tone, and that is what we are doing."
Last week, the White House confirmed that President Obama will attend the United Nations climate summit in New York, where he will meet with global leaders to build up momentum for an international treaty on climate change.