of polar bears will disappear by 2050, according to the US Geological Survey.
The minimum ice levels (measured during September) have decreased by 35.6% in 36 years.
Ice reflects the sun’s energy, open water absorbs it, which heats the water...which melts more sea ice.
Polar bears depend on sea ice for survival. Less ice means less:
[sources: National Snow and Ice Data Center, Polar Bears International]