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Illustration: Aïda Amer/Axios

Climate change wasn't front and center in last night's Democratic primary debate, but the topic produced some noteworthy moments.

Why it matters: It was the last debate before the Iowa caucuses, and multiple polls have shown that climate is among voters' priorities there.

A brief but telling scuffle broke out when a climate question arrived near the end.Amy Klobuchar, asked why she doesn't support calls to ban fracking, said natural gas is a "transition fuel" on the path to carbon neutrality by midcentury.

The other side: Bernie Sanders shook his head as she spoke. His plan includes a fracking ban and is generally far more aggressive than Klobuchar's.

  • Klobuchar also touted carbon pricing, which has lost cachet on the left and isn't in Sanders' plan.

Quick take: It highlighted the divide between moderate and left Democrats over the role of natural gas in the energy mix.

  • A standing reminder that a fracking ban is DOA in Congress (though a Democratic president could restrict fracking federal lands), and getting to net-zero emissions by 2050, let alone sooner, would be immensely difficult.

The big picture: Several moments captured the way climate is now stitched into the fabric of Democrats' discussion of lots of topics — and why Sanders' approach excites young activists.

Take the moment when Sanders cited the absence of climate provisions to explain his opposition to the USMCA trade deal.

  • When his USMCA answer veered into a mini-speech on climate, The Des Moines Register's Brianne Pfannenstiel interjected, "We're going to get to climate change, but I'd like to stay on trade."
  • Sanders replied, "They are the same in this issue."

My thought bubble: That view of climate as the mother of all cross-cutting topics is a reason Sanders is so popular in the Green New Deal camp.

More climate highlights

1. Candidates knew their audience as they made the case that their plans would help Iowa farmers. For instance, after frontrunner Joe Biden said, "We're the only country in the world that's ever taken great crisis and turned it into great opportunity," he added:

  • "And one of the ways to do it is with farmers here in Iowa, by making them the first group in the world to get to net-zero emissions by paying them for planting and absorbing carbon in their fields."

2. The heat from Australia's fires has made its way into the U.S. contest. Sanders, Tom Steyer and Pete Buttigieg all cited the fires. "This is no longer theoretical and this is no longer off in the future," Buttigieg said of the effects of climate change.

3. Biden didn't emphasize climate as much as Sanders and Steyer. He stuck to his message of citing his past work (including green energy spending in the 2009 stimulus) and job opportunities from building out climate-related infrastructure.

  • But, but, but: Biden gaffed a bit when he touted "12 billion gallons of gasoline — barrels of gasoline to be saved immediately" by reinstating mileage rules implemented when he was VP.
  • He's presumably referring to 2012 estimates that standards imposed through 2025 would save 12 billion barrels of oil over the life of the covered vehicles.

Go deeper: 4 takeaways from the 7th Democratic debate

Go deeper

Supreme Court agrees to hear challenges to Texas abortion law

Photo: Saul Loeb/AFP via Getty Images

The Supreme Court on Friday agreed to hear two cases challenging Texas' abortion law, which bans the procedure as soon as six weeks into pregnancy, but left the law in place in the meantime.

Why it matters: The court is moving extraordinarily fast on the Texas case, compressing into just a few days a process that normally takes months. And that schedule means the court will take up Texas' ban a month before it hears another major abortion case — a challenge to Mississippi's ban on abortions after 15 weeks.

Officials warn 5 key tech sectors will determine whether China overtakes U.S.

Illustration: Aïda Amer/Axios

U.S. intelligence officials responsible for protecting advanced technologies have narrowed their focus to five key sectors: artificial intelligence, quantum computing, biotechnology, semiconductors and autonomous systems.

Why it matters: China and Russia are employing a variety of legal and illegal methods to undermine and overtake U.S. dominance in these critical industries, officials warned in a new paper. Their success will determine "whether America remains the world’s leading superpower or is eclipsed by strategic competitors."

5 hours ago - Health

Pfizer says COVID vaccine over 90% effective in kids

Photo: Michael M. Santiago/Getty Images

Pfizer and BioNTech said their COVID-19 vaccine was more than 90% effective at protecting children between the ages of 5 and 11 from symptomatic infections from the virus, according to a study posted online by the FDA Friday.

Why it matters: Pfizer is seeking an emergency use authorization to vaccinate children — one of the last groups of Americans still largely ineligible to receive a coronavirus vaccine.