The federal government's approval of a Glacier Discovery Walk in Jasper National Park has raised concerns about the impact increased tourism will have on the Columbia Icefield — specifically, on the Athabasca Glacier, which will be the walk's main attraction.

The glacier is already the most visited glacier in North America and has been receding at an accelerated pace because of global warming.

Many other natural sites around the world are under threat from a combination of development, tourism and climate change. We take a look at some of them.

Galapagos Islands, Ecuador

The site of some of Charles Darwin's most pivotal discoveries of evolution, this archipelago of volcanic islands in the Pacific Ocean off the coast of Ecuador is known for its rich biodiversity. Hundreds of species of plant and animal life found on the islands do not exist anywhere else, but these are under threat from the more than 150,000 visitors a year who come to the islands as well as from invasive species that have been introduced to the islands over the years.

Everglades National Park, Florida

This subtropical wetland at the southern tip of Florida is beloved for its impressive mangrove forests and diverse plant and animal life. The park has been damaged by residential development and poorly regulated tourism.

Great Barrier Reef, Australia

A tourist swims on Australia's Great Barrier Reef, one of the most popular tourist destinations in the world. Over-fishing, pollution and rising ocean temperatures threaten the precious ecological site. (Handout/Greenpeace/Reuters)

The 2,000-kilometre reef off the coast of Queensland state is the world's largest and is home to hundreds of species of marine life, including many types of hard and soft coral and six of the world's seven threatened species of marine turtle. The reef faces threats from fishing, pollution — especially from the pesticides, fertilizers, sediment and other agricultural and mining run-off that washes up on the reef via the river systems that drain into the ocean — rising sea temperatures, which are exacerbating the bleaching of coral, and the shale oil industry. Tourist activities such as snorkeling and diving are not considered as big a threat to the reef as the other activities.

Dead Sea

The mineral-rich waters of the Dead Sea, which lies between Israel and Jordan, draw international tourists who float easily in water that is 10 times as salty as seawater. The lake — which has a surface 417 metres below sea level and is the lowest place on earth — and the many hotels and resorts that dot its shorelines generate millions of dollars in tourism revenue, but it's not the tourists who pose the greatest threat to the lake. It's the increased water consumption on the rivers upstream from the Dead Sea and at the mining operations on the lake itself that has been causing water levels to decrease at an alarming rate in recent years. The lake, which is about 85 kilometres long and about 17 kilometres wide, is mined for potash, salt and other minerals that are used in cosmetics, fertilizers, cars and computers.

Machu Pichu, Peru

One of the most important archeological and cultural sites in Latin America, these ruins of an ancient city of the Inca empire sit 2,430 metres above sea level in a tropical mountain forest in the Peruvian Andes. The much-visited UNESCO world heritage site has been flagged as being under threat from urban development, tourism and neglect.

Virunga National Park, Democratic Republic of Congo

A baby mountain gorilla and its mother feed on the slopes of Mount Mikeno in Virunga National Park in the Democratic Republic of Congo. The park is one of only a few places in the world where the threatened mountain gorillas live. (Peter Andrews/Reuters)

This 7,800-square-kilometre park, which is Africa's oldest national park, is known for its population of mountain gorillas, which number fewer than 800 in the world, and the diversity of its many kinds of habitats, which include active volcanoes, mountains, icefields, savannas, swamps and steppes. The park's wildlife and habitats have been damaged by the country's protracted civil war, which among other things forced the park's rangers to flee and brought in an influx of refugees who poached the park's animals and cut down its forests. Poaching, habitat destruction and the felling of trees for charcoal production continue to threaten the park, and although the civil war is officially over, park rangers are still being ambushed by militia fighters and poachers.

Belize Barrier Reef Reserve System

Tens of thousands of visitors a year flock to the coastal area that includes a barrier reef that is the largest in the northern hemisphere and the second largest in the world. The area also features mangrove forests, sand cays, coastal lagoons and coral islands. The reef system, which extends almost 300 kilometres from the Belize-Mexico border south to close to the Guatemalan border and has been divided into seven marine reserves and national parks, is home to an impressive array of plant and marine life, including threatened species of marine turtle, manatee and the American crocodile. The influx of tourists and the associated hotels, tour operators and recreation industry have put great pressure on the reef system, as has over-fishing, pollution and climate change.