Democrats agree they want to act on climate change, but even before they take charge of the House, they are signs of cracks in their coalition over how to advance the cause.

On Tuesday, while in Washington for new member orientations, the most prominent of newly-elected Democrats, New York’s Alexandria Ocasio-Cortez, joined climate demonstrators at the office of Minority Leader Nancy Pelosi to demand more aggressive action on greenhouse gases.

Pelosi said she would reprise a select committee on climate change that Republicans dissolved in 2011 when they took over House leadership. But Ocasio-Cortez and other young progressive Democrats want the committee to have more powers than it did previously, including the ability to write legislation to move the country to 100 percent renewable electricity generation within a decade.

Pelosi’s idea of reviving the panel has not been well received by others in the party, including by New Jersey Rep. Frank Pallone Jr., who is in line to chair the House Energy and Commerce Committee, which has jurisdiction over Clean Air Act issues.

“I think that it is unnecessary and my fear is that it will just delay the very aggressive action that we intend to take,” Pallone told reporters on Thursday. “I think that we can have a very aggressive agenda that we can get caucus consensus on and that we can get some Republicans on.”