A group of Democratic presidential hopefuls sparred over climate change policies Wednesday night, spending several minutes discussing the issue in the first primary debate of the 2020 race.

ADVERTISEMENT Inslee, who has based nearly his entire campaign on combating climate change, argued that he was the only Democratic candidate who would promise to make the issue their first priority if elected to the White House.

"The most important thing on this, and the biggest thing for the American public, is — who is going to make this the first priority?" Inslee said. "I am the only candidate who says this has to be the top issue."

O'Rourke, who like Inslee has introduced a policy proposal to address climate change if he were to win, pointed to carbon capture as a method he'd utilize to fix the issue.

"Houston and Miami, those people are on the front lines of climate change today — we are going to free ourselves from the dependence of fossil fuels and capture more carbon in the air, and keep more in the soil," he said.

Ryan dodged offering specifics on a climate plan he might have, instead warning that Democrats risked losing middle-class and Midwestern voters by focusing on "coastal" and "Ivy League issues."

"We can talk about climate. We can talk about guns. We can talk about all of these issues we care about. We have a perception problem with the Democratic Party," he said.

"We are not connecting to the middle-class people. We have got to hinge the center of gravity from being coastal and elitist and Ivy League ... to getting those workers back on our side so we can say we are going to build solar, we are going to build electric vehicles."

Candidates debated potential approaches to combating climate change after the topic was raised by moderators near the end of the two-hour debate.