A U.S. Park Ranger at Joshua Tree National Park. Photo: Will Lester/MediaNews Group/Inland Valley Daily Bulletin via Getty Images

National parks are rushing to clean up trash and repair damage caused by visitors who created unauthorized trails and vandalized natural structures during the 35-day government shutdown, as another potential shutdown looms on Feb. 15, the AP reports.

Why it matters: Conservationists say damage to sensitive lands can take decades to recover — especially for vandalized Joshua trees, which are essential to the namesake national park's ecosystem and were cut down by visitors who drove into restricted areas while the park was unguarded. Even before the damage caused during the shutdown, national parks were dealing with approximately $12 billion worth of a maintenance backlog, a figure that is now set to grow.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 8:30 p.m. ET: 30,911,999 — Total deaths: 959,059— Total recoveries: 21,147,903Map.
  2. U.S.: Total confirmed cases as of 8:30p.m. ET: 6,796,384 — Total deaths: 199,474 — Total recoveries: 2,590,671 — Total tests: 95,108,559Map.
  3. Politics: Testing czar on Trump's CDC contradictions: "Everybody is right" Ex-FDA chief: Career scientists won't be "easily cowed" by political vaccine pressure.
  4. Education: What we overlooked in the switch to remote learning.
  5. Health: The dwindling chances of eliminating COVID-19 — 7 states set single-day coronavirus case records last week.
  6. World: England sets £10,000 fine for breaking self-isolation rules — The countries painting their pandemic recoveries green.

Arrest over letter to Trump containing poison ricin

President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement forces said.

Trump campaign goes all in on Pennsylvania

Trump poster in Scranton, Pennsylvania. Photo: Robert Nickelsberg/Getty Images

The president's campaign is placing more importance on Pennsylvania amid growing concern that his chances of clinching Wisconsin are slipping, Trump campaign sources tell Axios.

Driving the news: Pennsylvania, which has 20 electoral votes, twice Wisconsin's number, actually has been trending higher in recent public and internal polling, a welcome development for the campaign.