Illustration: Rebecca Zisser/Axios

Nascent tech that pulls CO2 from the atmosphere could "significantly" reduce the costs of fighting climate change, but achieving scale is hardly a sure thing and massive deployment would consume lots of energy, a new peer-reviewed study warns.

Why it matters: The paper in Nature Communications arrives amid increasing attention to direct air capture (DAC) and other negative emissions technologies. They're important because it looks pretty unlikely that nations will cut emissions enough to meet the goals of the Paris climate deal.

  • The firm Carbon Engineering — whose backers include Bill Gates and oil giants Chevron and Occidental — recently announced plans for a big DAC plant in Texas.

What they found: According to the study, widespread deployment down the road would create a longer cushion to achieve steep emissions cuts.

  • In one scenario they modeled for holding global temperature rise to 1.5°C, it pushes the horizon for achieving "net-zero" emissions back from 2050 to roughly 2070, which would be "compensated by larger negative emissions thereafter."

Threat level: If policymakers wrongly bet on large-scale deployment, it could lead to a global temperature "overshoot" of up to 0.8 °C. That's a lot, given that Paris aims to limit the total increase to 1.5°C–2°C above preindustrial levels.

  • And large-scale deployment (think tens of thousands of big machines under one tech scenario), if even proven feasible would need to be really large, and that's not without consequences.
  • In theory, a huge buildout would consume as much as a fourth (!) of global energy demand to power and heat the systems by 2100, the paper notes.

The bottom line: The paper warns that DAC should not be viewed as a crutch, but rather as complementary to emissions-cutting strategies.

  • The authors recommend that policymakers speed up development and deployment, but "without easing near-term mitigation efforts" due to risks of the tech underperforming or failing.

Go deeper, via Carbon Brief: Direct CO2 capture machines could use ‘a quarter of global energy’ in 2100

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Updated 3 mins ago - World

China says U.S. is "endangering peace" with high-level visit to Taiwan

Health and Human Services Secretary Alex Azar during a June briefing in Washington, DC. Photo: Joshua Roberts/Getty Images

Health and Human Services Secretary Alex Azar announced Tuesday night he will lead a delegation to Taiwan "in the coming days."

Why it matters: It's the highest-level visit by a U.S. cabinet official to Taiwan since 1979. Azar is also the first U.S. Cabinet member to visit the island state in six years. The visit has angered China, which views Taiwan as part of its territory. Chinese officials accused the U.S. early Wednesday of "endangering peace" with the visit, AFP reports.

Updated 47 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 3:30 a.m. ET: 18,543,662 — Total deaths: 700,714 — Total recoveries — 11,143,031Map.
  2. U.S.: Total confirmed cases as of 3:30 a.m. ET: 4,771,236 — Total deaths: 156,807 — Total recoveries: 1,528,979 — Total tests: 57,543,852Map.
  3. States: New York City health commissioner resigns in protest of De Blasio's coronavirus response — Local governments go to war over schools.
  4. Public health: 59% of Americans support nationwide 2-week stay-at-home order in NPR poll.
  5. Politics: Trump's national security adviser returns to work after coronavirus recovery Republicans push to expand small business loan program.
  6. Sports: Indy 500 to be held without fansRafael Nadal opts out of U.S. Open.
Updated 2 hours ago - World

At least 100 killed, 4,000 injured after massive explosion rocks Beirut

Photo: Anwar Amro/AFP via Getty Images

A major explosion has slammed central Beirut, Lebanon, damaging buildings as far as several miles away and injuring scores of people.

Driving the news: At least 100 people have been killed and over 4,000 injured in the blast — and the death toll is likely to rise, the Lebanese Red Cross said, per AP. Prime Minister Hassan Diab said the explosions occurred at a warehouse that had been storing 2,750 tons of ammonium nitrate for the past six years.