(CNN) Sen. Dianne Feinstein clashed Friday with a group of children over climate change policy, criticizing their requests that she back the Green New Deal, accusing them of presenting an ultimatum and contrasting their inability to vote with her three decades in office.

The exchange comes as moderate Democrats grapple with the Green New Deal , a 10-year plan to mitigate climate change championed by progressives such as Rep. Alexandria Ocasio-Cortez of New York.

In a video posted on Facebook by the Sunrise Movement, a youth climate-change advocacy group, more than a dozen children and several adults from multiple advocacy organizations including Sunrise Movement and Youth vs. Apocalypse, another youth climate-change advocacy group based in the San Francisco Bay Area, meet with the senator to present her a letter they wrote and ask her to vote yes on the deal. The California Democrat argues that the policy is unworkable and says she doesn't agree with it.

"There's reasons why I can't, 'cause there's no way to pay for it," she says, adding, "I don't agree with what the resolution says. That's part of it."

"That resolution will not pass the Senate, and you can take that back to whoever sent you here," she says, citing that the deal doesn't have a single Republican in favor of the proposal and "the key to good legislation is to tailor something that you write so that it can pass, and you can get a step ahead."

Read More