A clear day at Acadia National Park in Maine.
US national parks protect some of America's most spectacular outdoor settings. But new research shows that ozone pollution levels in the parks are roughly as bad as in major cities.
The wilderness in Canada’s parks is shrinking due to encroaching business. Pictured here: the Glacier Skywalk in Jasper National Park is cantilevered 280 metres over the Sunwapta Valley floor.
Canada's national parks don't need more visitors. They could use more scientists, and better science, to help conserve the country's species.
People transporting gasoline by boat in Indonesia’s Kayan Mentarang National Park.
The world's national parks cover an area bigger than South America. But a new survey finds that one-third of this area is subject to pressure from human developments, potentially putting wildlife at risk.
Ullswater in The Lake District National Park.
Smart technology can help the environment, preserve biodiversity and protect sensitive areas, such as national parks.
Young men and overseas tourists are particularly at risk.
New research shows what type of signs are most effective at communicating safety messages in national parks - and what not to do.
Bridge built by CCC workers, Shady Lake Recreation Area, Arkansas.
On April 5, 1933, President Franklin Roosevelt created the Civilian Conservation Corps, a massive relief program that paid young men to plant trees and build parks across the nation. It was money well spent.
El Cocuy National Park.
One of Colombia's most beautiful areas, El Cocuy National Natural Park was for years too dangerous to visit. No more.
In Big Bend National Park’s Santa Elena Canyon, the Rio Grande separates the United States (left) from Mexico (right).
Instead of building a wall on the US-Mexico border, a landscape architect calls for restoring the Rio Grande and turning its course into an international park – an idea first proposed in the 1930s.
Browns Canyon National Monument, Colorado.
Bob Wick, BLM
Within the next month, the Trump administration may move to abolish or shrink up to two dozen national monuments. Our experts explain why these sites matter and whether presidents can undo them.
A red fox listening for prey under the snow in Yellowstone National Park. Noise can affect foxes and other animals that rely on their hearing when they hunt.
A recent study finds that noise from human activities is intruding into many parks and other protected areas. Creating quiet zones and noise corridors can help reduce impacts from noise pollution.
The Trump administration will review the status of The Bears Ears National Monument in Utah, one of the country’s most significant cultural sites.
Bureau of Land Management
Trump wants to scale back national monuments on federal lands in the name of boosting the economy. But this would undo decades of investments to manage our cultural and ecological resources.
Public goods come in many forms, from highways to magnificent mountains.
Road sign via www.shutterstock.com
The U.S. owes much of its prosperity to investment in public goods like highways, parks and schools. Trump's budget poses a threat to these goods, which have already been on the decline.
The Simien mountains in Ethiopia are one of the world’s most threatened natural heritage sites.
Simien mountains image from www.shutterstock.com
You'd hope we wouldn't flatten the pyramids to build a highway. But that's exactly what's happening to the world's natural heritage sites.
Cleared habitat in Niassa Reserve, Mozambique.
Since 1992, an area of land two-thirds the size of Australia has been converted to human use.
There are fewer than a thousand Graveside gorge wattles in Kakadu National Park.
We know very little about Australia's most threatened plants.
A valuable harvest.
American ginseng, a slow-growing native plant long used in traditional medicine, was abundant in colonial times. Now illegal harvesting and other stresses are pushing it close to extinction.
Wild horses are wreaking havoc in Australia’s mountains.
Long Road Photography (formerly Aff)/Flickr
Horses need to be removed from Australia's mountains. The debate now is around ethics and their role in Australian culture.
Zebras are among the larger wildlife doing well in protected areas.
New research shows protected areas are doing well at protecting large, iconic wildlife, but less well at helping smaller species.
Human climate change has shifted vegetation and wildlife upslope in Yosemite National Park.
The National Park Service's principal climate scientist explains why the parks are important laboratories for climate change research, and how climate change is altering the parks.
The endangered Hawaiian monk seal is one of the 7,000 species that gained a measure of protection.
U.S. Fish and Wildlife Service
The Papahānaumokuākea Marine National Monument is huge win for preservation, but it also poses outsized management challenges for the National Park Service.