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The Real Arctic
Circle's Ice is Melting
The Arctic ice is
melting at an unprecedented rate.
So much ice has disappeared that in
the summer of 2007, the Northwest
passage became navigable. At this
rate, there may be no summer ice by
2030. This may be good for shipping,
but it is not so good for polar bears,
who need the sea ice to hunt for food.
Arctic temperatures
are rising because of global warming
- climate change brought about by
emissions of greenhouse gases like
carbon dioxide and methane. Human
activity has increased the levels
of greenhouse gases and human activity
can decrease them.
A lot of people
making little changes to their lives
can have a positive effect.
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