Illustration: Sarah Grillo/Axios

Global warming has burst into national politics as major Democratic 2020 hopefuls release aggressive plans and the party's voters prioritize the topic.

Where it stands: Several polls show climate change has broken through. This month, a CBS News survey found 78% of Democratic voters in early primary states call the topic "very important," putting it behind only health care.

Quick take: Forces prompting the increased attention from Democratic voters and candidates include...

  • Trump abandoning Obama-era policies.
  • High-profile Democrats led by Rep. Alexandria Ocasio-Cortez promoting the Green New Deal.
  • Heatwaves and scientific reports over the last year warning of the dangers of failing to stem emissions.

What they're saying: Zac McCrary with the Democratic polling firm ALG Research said the voter interest isn't a fad. Instead there's been a "fundamental, foundational shift in voters' attitudes, rather than reacting to any given event or point in time," he said.

  • Voter interest and a record of campaign trail promises could prompt a Democratic president to devote real political capital to tougher policies.
  • But, but, but: Absent unexpectedly large Democratic gains in the Senate or a change to filibuster rules, major legislation faces daunting odds.

What to watch: CNN will host a presidential candidate forum on climate change in September, and MSNBC is a media partner on another event — strong signals of the topic's entry to the national political stage.

Read more about the impacts of climate change we're tracking:

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Updated 10 mins ago - Politics & Policy

Supreme Court clears way for first federal execution since 2003

Lethal injection facility in San Quentin, California. Photo: California Department of Corrections and Rehabilitation via Getty Images

The Supreme Court ruled early Tuesday that federal executions can resume, reversing a lower court decision and paving the way for the first lethal injection since 2003 to take place at a federal prison in Indiana, AP reports.

The big picture: A lower court had delayed the execution, saying inmates had provided evidence the government's plan to carry out executions using lethal injections "poses an unconstitutionally significant risk of serious pain."

1 hour ago - Health

More Republicans say they're wearing masks

Data: Axios/Ipsos poll; Chart: Andrew Witherspoon/Axios

Nearly two-thirds of Americans — and a noticeably increasing number of Republicans — say they’re wearing a face mask whenever they leave the house, according to the latest installment of the Axios-Ipsos Coronavirus Index.

Why it matters: A weakening partisan divide over masks, and a broad-based increase in the number of people wearing them, would be a welcome development as most of the country tries to beat back a rapidly growing outbreak.

Buildings are getting tested for coronavirus, too

Illustration: Eniola Odetunde/Axios

Testing buildings — not just people — could be an important way to stop the spread of the coronavirus.

Why it matters: People won't feel safe returning to schools, offices, bars and restaurants unless they can be assured they won't be infected by coronavirus particles lingering in the air — or being pumped through the buildings' air ducts. One day, even office furniture lined with plants could be used to clean air in cubicles.