Fill in the Blanks Endangered spiciesOnline version Read and fill the gaps by Mª Ángeles Salinas Alemany 1 In spring 2008 , the polar bear was placed on the list . According to the endangered Spicies Act , an endangered spicies is an animal that is likely to face in its . Polar bears have been categorized as a " threatened " spicies . The ESA defines threatened spicies as one that is likely to become " endangered " in the foreseeable future . The polar bear is the firts animal that has been classified as endangered due primarily to . Global warming is caused by carbon dioxide and other greenhouse gases that become trapped in the atmosphere . Heating homes , driving cars and burning garbage all require fossil fuels that lead to global warming . The polar bear's habitat is move to global warming thatn other spicies . Polar bears live mainly on the sea ice in the Artic . This is where they hunt for fish and build up fat reserves . When the ice melts many polar bears move to land and live off their stored fat . In the Artic , global warming is causing the ice to mest slightly earlier and form slightly later . This results in a shorter feeding season for the polar bear . Some risk their lives to find ice . If they have to swim too far they will drown from exhaustion ang hunger . The World Wildlife Fund estimates that 25% of the Artic sea ice has disappeared in the past 30 years . It is not only the polar bear tha is at risk in the Artic . Every species of plant , animal , and insect there is threatened by global Warming . Nevertheless , groups such as the World Wildlife Fund often study large carnivores in order to assess the health of an . The Artic reles on the polar bear . In addition , donations are more commonly offered for the protection of large animals such as bears or elephants . People in general are interested in conservation efforts that protect small wildlife , such as plants or insects . However , by using donor money to protect the habitat of the larger animals ( ex . ) , entire ecosystems can be protected . It is important that animals such as the polar bear make it onto the endanrered spicies list . Once they are on the list there are laws that protect these animals from being hunted for food or sport . Agencies also receive money and tools to protect the habitat and the spicies . The goal of removing the animal from the list is often achievable . Since the Endangered Spicies Act was introduced in the US in 1973 , many spicies have been taken off the list due to increased population . In fact , it is rare for a spicies to go extinct after they makke the list . Sadly many species do go extinct while waiting for consideration .
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