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A study suggests solar geoengineering could work most effectively by trying to blunt half of expected global warming, rather than all of it.

Why it matters: Government policies to cut carbon emissions aren't on target to keep warming below dangerous levels, so geoengineering may eventually be necessary. By aiming for a more modest offset of the warming to come, researchers may be able to maximize the benefits while minimizing the risks.

How it works: Solar geoengineering involves trying to directly cool the climate by injecting aerosols into the atmosphere, which would reflect incoming sunlight.

Details: The new study, published in Environmental Research Letters, used computer models to conclude that putting enough aerosols into the stratosphere to cut expected warming in half appeared to hit the sweet spot of slowing climate change without inadvertently making it worse in some regions.

"When used at the right dose and alongside reductions in greenhouse gas emissions, stratospheric aerosol geoengineering could be useful for managing the impacts of climate change."
— Peter Irvine, University College London, lead author

Go deeper: Climate change's surprise twist

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2 hours ago - Health

Fauci says if people won't wear masks, maybe it should be mandated

Anthony Fauci. Photo: Graeme Jennings- Pool/Getty Images

NIAID director Anthony Fauci told CNN on Friday evening that if "people are not wearing masks, then maybe we should be mandating it."

Why it matters: Fauci made the comments the same day the U.S. hit its highest daily COVID-19 case count since the pandemic began.

Harris to Black voters: Casting a ballot is about honoring your ancestors

Democratic vice presidential nominee Kamala Harris speaks at a "Get Out The Vote" rally at Morehouse College. Photo: Elijah Nouvelage/AFP via Getty Images

Sen. Kamala Harris appealed to Black voters in Georgia on Friday, urging them to "honor the ancestors" by casting ballots, and again calling President Trump a "racist."

Why it matters: The U.S. saw a significant decline in African-American voter turnout between 2012 and 2016, reaching its lowest point since 2000. Higher turnout among Black Americans this year could tip the balance in favor of Democrats in key battleground states, including Georgia.

Updated 3 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Politics: Fauci: Trump hasn't been to a COVID task force meeting in months.
  2. Sports: The youth sports exodus continues — Big Ten football is back.
  3. Health: U.S. hits highest daily COVID-19 case count since pandemic began —AstraZeneca to resume vaccine trial in U.S.How to help save 130,000 lives.
  4. Retail: Santa won't greet kids at Macy's this year.
  5. World: Spain and France exceed 1 million cases.