AI-assisted summary
Hundreds of former National Park Service employees are urging the closure of all national parks until the government shutdown ends.
Furloughed staff have led to uncollected trash, overflowing toilets, and other hazards in national parks.
Despite the shutdown, Grand Canyon's roads, trails, lodges, and shuttle system are currently accessible to visitors.
Grand Canyon National Park has remained open through the government shutdown.
But continuing to leave it and other national parks unstaffed can lead to dangerous conditions, according to a letter signed by about 450 former National Park Service employees, posted on the website of the Coalition to Protect America's National Parks .
The former park employees called on U.S. Interior Secretary Doug Burgum to close al

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