Regions with a polar climate are characterized by a lack of warm summers. Every month in a polar climate has an average temperature of less than 10 °C (50 °F).
Regions with polar climate cover over 20% of the Earth. The sun shines for long hours in the summer, and for many fewer hours in the winter. A polar climate results in treeless tundra, glaciers, or a permanent or semi-permanent layer of ice. A tundra climate is characterized by having at least one month whose average temperature is above 0 °C (32 °F), while an ice cap climate has no months above 0 °C (32 °F). In a tundra climate, trees cannot grow, but other specialized plants can grow. There are two types of polar climate: ET, or tundra climate; and EF, or ice cap climate. A tundra climate is characterized by having at least one month whose average temperature is above 0 °C (32 °F), while an ice cap climate has no months above 0 °C (32 °F). In a tundra climate, trees cannot grow, but other specialized plants can grow. The main concern about climate change effects on polar bears is habitat loss and changes to sea ice habitat. The sea ice on which polar bears depend has undergone recent declines in area, duration of cover, and thickness as a result of climate warming. A warming climate is altering sea ice conditions, which affects polar bears in many ways, including: 1  more difficulty in getting to and hunting prey. 2  fewer den areas and lower cub survival. 3  increased interactions between bears and humans. A symbol of the Arctic, polar bears are the world’s largest land predator and biggest member of the bear family. With heavy fur, blubber up to four inches thick and black skin that absorbs heat from the sun, polar bears are amazingly well adapted to the Arctic climate.  Regions with a polar climate are characterized by a lack of warm summers. Every month in a polar climate has an average temperature of less than 10 °C (50 °F). A tundra climate is characterized by having at least one month whose average temperature is above 0 °C (32 °F), while an ice cap climate has no months above 0 °C (32 °F). In a tundra climate, trees cannot grow, but other specialized plants can grow. Global Warming and Polar Bears. The chief threat to the polar bear is the loss of its sea ice habitat due to global warming. As suggested by its specific scientific name (Ursus maritimus), the polar bear is actually a marine mammal that spends far more time at sea than it does on land. As climate change melts sea ice, the U.S. Geological Survey projects that two thirds of polar bears will disappear by 2050. This dramatic decline in the polar bear is occurring in our lifetime, which is but a miniscule fraction of the time polar bears have roamed the vast Arctic seas. Polar ecology is the relationship between plants and animals in a polar environment. Polar environments are in the Arctic and Antarctic regions. Arctic regions are in the Northern Hemisphere, and it contains land and the islands that surrounds it. Antarctica is in the Southern Hemisphere and it also contains the land mass, surrounding islands and the ocean. Polar climates are cold, windy and dry. Because of the lack of precipitation and low temperatures the Arctic and Antarctic are considered the world's largest deserts or Polar deserts. Much of the radiation from the sun that is received is reflected off the snow making the polar regions cold. Antarctica is the only continent on earth where a polar climate dominates. The Arctic is more diverse. In the Arctic, tundra is found in the southern regions, and ice caps are further north. As Santa Claus and his reindeer will tell you, the north pole is a cold, dry and windy place only fit for the Abominable Snowman. All myths aside, the Arctic polar region is generally kinder and gentler than its southern counterpart, Antarctica. Arctic Weather and the Polar Environment. As Santa Claus and his reindeer will tell you, the north pole is a cold, dry and windy place only fit for the Abominable Snowman. All myths aside, the Arctic polar region is generally kinder and gentler than its southern counterpart, Antarctica. Polar Climate. Polar Climate. Polar Climate is a part of the World Climatic Regions which is marked with cold climatic conditions. Polar climatic regions lack warm summers and are marked with the absence of trees. Most of the areas are covered with glaciers or with semi-permanent layer of ice. 
https://en.wikipedia.org/wiki/Polar_climate https://en.wikipedia.org/wiki/Polar_climate http://www.actionbioscience.org/environment/derocher.html http://earthjustice.org/irreplaceable/polar-bear https://en.wikipedia.org/wiki/Polar_climate http://www.nwf.org/Wildlife/Threats-to-Wildlife/Global-Warming/Effects-on-Wildlife-and-Habitat/Polar-Bears.aspx https://en.wikipedia.org/wiki/Polar_ecology http://www.polarcruises.com/polar-info/arctic-info/arctic-weather-and-polar-environment http://www.polarcruises.com/polar-info/arctic-info/arctic-weather-and-polar-environment http://www.mapsofworld.com/referrals/weather/climate/polar-climate.html
what is the climate polar environment