This week in climate change, GOP frontrunner Donald Trump swept primaries in five states, edging his campaign closer to the delegate count needed to secure the nomination. Speaking in an interview Thursday morning, he reiterated his comparison between nuclear threats and climate threats.

“The power of weaponry today is the single greatest problem that our world has and it’s not global warming like our president said” Trump said. He has previously commented that, “our biggest problem is nuclear warming.”

Meanwhile, Ohio Gov. John Kasich, campaigning in Rockville, MD the day before that state’s primary, took a question on the environment from an 11-year old boy in the audience of a town hall meeting.

“I’m the one Republican who believes there’s climate change,” Kasich said to applause. “I have very little doubt human beings have an impact.”

Kasich went on to express his support for wind and solar energy projects that both encourage the use of renewables and provide economic development. “I’ve been an advocate for putting a wind turbine in front of every statehouse in America,” Kasich said.

In a move pundits speculate is driven by hopes to boost his chances in California, Texas Sen. Ted Cruz tapped former candidate Carly Fiorina as a running mate. While seeking the nomination on her own accord, Fiorina said she “takes the scientists at their word” on climate change but cautions Americans to “read the fine print.”

“All the scientists that tell us that climate change is real and man made also tell us this: a single nation acting alone will make no difference at all,” Fiorina said in numerous speeches and interviews.

The California primary is June 7th.