Today marks International Polar Bear Day, observed annually on 27 February to raise awareness of the protection of the threatened species. As of 2008, the International Union for Conservation of Nature (IUCN) reported that the global population of polar bears was between 20,000 and 25,000 - but is declining due to a number of factors.
In 2006, the IUCN upgraded the polar bear from a species of least concern to a vulnerable species. A report published in 2013 found that the polar bear population had grown by just 4,200 since 2001.
Still, risks to the creatures are reducing the population growth. Climate change, chemical pollution, conflicts with shipping, stresses from polar bear watching, and oil and gas exploration are all putting the animals in danger.
The IUCN, Arctic Climate Impact Assessment, and other leading organisations have expressed concerns about the impact of climate change, including the belief that the current warming trend imperils the survival of the species. The polar bear has still survived warmer periods than the present.
Polar bears also accumulate high levels of toxic chemicals, such as organic pollutants or chlorinated pesticides. Due to their position at the top of the food pyramid and their diet high in blubber - where halocarbons concentrate - their bodies are among the most contaminated of the Arctic mammals.