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Polar bears and Global Warming

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Jennifer Morales

on 25 April 2011

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Transcript of Polar bears and Global Warming

Polar Bears Polar Bears Drowning How are polar bears being impacted
by global warming? Population sizes decreasing Sea ice platforms moving farther apart and swimming conditions more dangerous Fewer Hunting opportunities and increased
scarcity of food Some polar bears have drowned while
attempting to swim to safety after being
trapped on small islands of melting ice. Found in cold ocean waters
or on ice drift Found all over the Artic regions
Seals are their main food Global Warming is now
the biggest threat to polar bears It is destroying all of the ice that they
need to survive on Research has found that the cubs are
not surviving as well Researchers found adult polar bears
didn't weigh as much Polar Bears population
is stable or increasing Where are they? There increasing, both in North-Eastern Canada, were severly reduced by hunting in the past Global warming is causing an unnatural increase and stable in Arctic temperatures The Arctic Assessment proclaimed that Arctic air temperature trends provide an early and strong indication that global warming is causing polar ice caps and glaciers to melt. However, current research suggests that coastal stations in Greenland are instead experiencing a cooling trend, and average summer air temperatures at the summit of the Greenland Ice Sheet have decreased at the rate of 4°F per decade since measurements began in 1987. The maximum air temperature reported for the 20th century was in 1938, when it was nearly 0.4°F warmer than in 2000. By Jennifer Morales Rising temperatures cause sea ice to
melt, especially in the summer months
when the polar bears are the most active.
Polar bears depend on sea ice as habitat for
hunting and dens. Global Warming Global warming is when
the earth heats up (the
temperature rises). It happens
when greenhouse gases (carbon
dioxide, water vapor, nitrous oxide,
and methane) trap heat and light
from the sun in the earth’s
atmosphere, which increases the
temperature Polar Bears Population sea ice decreases, polar bears have to swim
farther to find suitable habitat and it takes
much longer to find a meal Polar bears need our help
the best way you can help polar bears is by reducing your carbon emissions
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