Vegetation declining on elephants' migration routes in Namibia

A study based on extensive remote sensing data indicates that vegetation near the migration routes of elephants in Namibia has decreased. Human habitation and fences as well as artificial obstacles of other kinds affect the ...

Gateway towns to Yellowstone become dead ends after flood

This gateway town to Yellowstone National Park has become a dead end, a casualty of the severe flooding that tore through one of America's most beloved natural attractions and swept away roads, bridges and homes.

California won't immediately list Joshua tree as threatened

California won't be listing the iconic western Joshua tree as a threatened species for now after the four-member Fish and Game Commission couldn't reach agreement Thursday on how best to protect the plant from climate change.

After Yellowstone, floodwaters menace Montana's largest city

Devastating floodwaters that wiped out miles of roads and hundreds of bridges in Yellowstone National Park and swamped scores of homes in surrounding communities moved downstream Wednesday and threatened to cut off fresh ...

Steep mountain slopes have surprisingly long lifetimes

Gravity and rock physics say slopes steeper than about 30°—known as the critical threshold angle, or the angle of repose—shouldn't really exist, yet they do. These steep slopes and near-vertical cliffs can be seen in ...

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National park

A national park is a reserve of land, usually declared and owned by a national government, protected from most human development and pollution. National parks are protected areas of IUCN category II. The largest national park in the world is the Northeast Greenland National Park, which was established in 1974. According to The World Conservation Union IUCN, there are now 6,555 national parks worldwide (2006 figure).

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