The demonstration featured speeches and the delivery of 200,000 petitions to the DNC demanding the party provide a space for candidates to discuss how they will handle the crisis.

LIVE: Activists deliver 200,000+ petition signatures demanding the @DNC hold a #ClimateDebate https://t.co/Ycc00lpOvT

— CREDO Mobile (@CREDOMobile) June 12, 2019

"The DNC is making it clear that the adults who got us into this crisis are unwilling to be the leaders to now solve this problem," U.S. Youth Climate Strike national finance director Karla Stephan said in a statement.

"We're not giving up — and we're not settling for soundbites," said Stephan. "We demand action."

The protest is a direct response to a Tuesday post on Medium from DNC chair Tom Perez, who wrote that it would be unfair to prioritize one issue over others. The DNC "must remain neutral in both practice and perception," wrote Perez.

"If we change our guidelines at the request of one candidate who has made climate change their campaign's signature issue, how do we say no to the numerous other requests we've had?" Perez wrote. "How do we say no to other candidates in the race who may request debates focused on an issue they've made central to their own campaigns?"

However, as The Daily Beast's Gideon Resnick pointed out, the climate crisis isn't seen as a marginal issue to the party's base.

The progressive argument against Perez is that a debate around climate change does not amount to a simple "pet issue," but rather one that voters and candidates alike have prioritized as an all-encompassing threat impacting people's everyday lives.

Green groups sounded off on the DNC decision in a series of statements.

"The irony of Tom Perez and the Democratic National Committee rejecting a climate debate while holding the upcoming debate in Miami, a city already impacted by storms and sea level rise, is not lost on us," said 350 Action's North America director Tamara Toles O'Laughlin.

"The DNC is effectively denying the will of the people, when really they should've learned lessons from the 2016 election," added O'Laughlin. "All of us deserve to know how the next U.S. president plans to act on Day One to protect our health, safety, and democracy."

Time is running out, said CREDO Action campaign manager Brandy Doyle.

"We don't have time for this," said Doyle. "We can't wait another four years for the Democratic Party to start taking the climate crisis seriously."

'This Is an Emergency. We Need the Democrats to Act Like It': Outrage as DNC Says It Won't Host a 2020 Debate on Climate Crisis - @EcoWatch https://t.co/kWOM0kSNf0

— John R. Platt (@johnrplatt) June 6, 2019