Do your bit to preserve the planet with our guide; 10 Easy ways to be the Ultimate Eco Travel Saint and Essential Tips on being a Responsible Traveller. This year’s World Tourism Day 2012 focuses on sustainable travel and all travellers are called to mark the day by making their own pledges.6. Polar Bears, Arctic Polar bears live in the Arctic in places such as Manitoba. They have adapted to this cold environment and freely hunt for food. However, the rising global temperatures are melting the glacier and ice in the Arctic at an alarming rate. Most scientists are worried that if this trend continues, the world will lose two thirds of the polar bear population by 2050. 7. Barrier Reef, Belize This coral relief barrier is located in Belize and is the largest in the southern hemisphere. Pollution and rising sea temperatures have led to coral bleaching, which is wiping out the unique staghorn coral that is predominant in this region. The mangroves are also disappearing due to increased urban development in the area. 8. Atsinanana Rainforest, Madagascar Madagascar is the fourth largest island in the world and is endowed with a unique ecosystem that is not present in any other part of the world. A century ago, the island was covered by 120,000 square miles of rainforest. Deforestation has wiped away a huge chunk of this forest and only 20,000 square miles are remaining today. If the rain forest completely disappears, most of the fauna and flora, such as lemurs will follow suit. Although the government has set up game reserves to protect these endangered species, they can only hold a few animals so some of them will still disappear. 9. Dead Sea, Jordan and Israel The Dead Sea is the most salty sea in the world and is the lowest point in the world at 1388 feet below sea level. The sea attracts a lot of tourists since its waters are rumoured to contain certain beneficial chemicals that heal any skin problems. The source of the Dead Sea is River Jordan, whose waters have been diverted for farming activities and drinking. The Dead Sea is slowly shrinking since most water from River Jordan is diverted to cater for human needs. It is estimated the sea is shrinking at the rate of four feet per year and might dry up in the next 25 years. 10. Patagonian Ice Fields, Chile The Patagonian ice fields located in Chile are the third largest in the world. They are disappearing at an alarming rate as the rising global temperatures are melting the ice and glacier from the mountains. Most glacier lakes in the region have completely disappeared due to global warming. The ice fields will lose their aesthetic appeal, if the mountain glaciers continue melting.