May 26, 2017

There are more leaves covering parts of Earth due to carbon dioxide

Charles Krupa / AP

Substantial portions of Earth are increasingly covered in vegetation in response to increases in carbon dioxide in the atmosphere and changes in land use, a new study finds. But the increases have significantly different impacts on the planet's climate depending on whether it's happening in boreal forests in places like Canada and the Arctic or arid regions like the sub-tropics in and around the Horn of Africa.

What it means: Climate models are constantly being refined to reflect advances in science and improvements in data sets. This new study on leaf abundance will help predict impacts more accurately at the regional level.

For example: Increases in leaf abundance in boreal forests causes a significant increase in global warming, because that part of the Earth grows darker and doesn't reflect as much sunlight back into space. This sort of greening that reduces surface albedo could be adding an additional 10% to warming. However, in arid regions, this increase in leafy vegetation may actually be slowing the effects of global warming by up to 14% through a process called transpiration, in which water evaporates from leaves and enters the atmosphere.

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Coronavirus dashboard

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  1. Global: Total confirmed cases as of 8 a.m. ET: 1,131,713 — Total deaths: 59,884 — Total recoveries: 233,591Map.
  2. U.S.: Total confirmed cases as of 8 a.m. ET: 278,458 — Total deaths: 7,159 — Total recoveries: 9,897Map.
  3. Public health latest: The CDC is recommending Americans wear face coverings in public to help stop the spread of the coronavirus. The federal government will cover the costs of COVID-19 treatment for the uninsured, Health and Human Services Secretary Alex Azar said.
  4. 2020 latest: "I think a lot of people cheat with mail-in voting," President Trump said of the 2020 election, as more states hold primaries by mail. Montana Gov. Steve Bullock said Friday that every county in the state opted to expand mail-in voting for the state's June 2 primary.
  5. Business updates: America's small business bailout is off to a bad start. The DOT is urging airlines to refund passengers due to canceled or rescheduled flights, but won't take action against airlines that provide vouchers or credits.
  6. Oil latest: The amount of gas American drivers are consuming dropped to levels not seen in more than 25 years, government data shows. Trump is calling on the Energy Department to find more places to store oil.
  7. Tech updates: Twitter will allow ads containing references to the coronavirus under certain use cases.
  8. U.S.S. Theodore Roosevelt: Senators call for independent investigation into firing of Navy captain.
  9. What should I do? Answers about the virus from Axios expertsWhat to know about social distancingQ&A: Minimizing your coronavirus risk.
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The renaissance of the American family

Illustration: Eniola Odetunde/Axios

It used to be scarce and hard-earned, but suddenly family time is abundant in the era of shelter-in-place.

Why it matters: For the first time since the early 19th century, many parents and kids — and even grandchildren — are all under the same roof round-the-clock. And if past periods of emergency are any guide, this enforced togetherness could deepen our relationships for years to come.

Biden says he's starting VP search this month

Joe Biden. Photo: Scott Olson / Staff

Joe Biden said he's spoken to Sen. Bernie Sanders and former President Barack Obama about selecting a running mate — and that he wants to build "a bench of younger, really qualified people" who can lead the nation over the course of the next four presidential cycles.

Driving the news: Biden spoke about the state of the 2020 race during a virtual fundraiser on Friday night that was opened to pooled coverage.