Since 1979, more than 20% of the polar ice cap has melted away. The main cause for this is greenhouse gasses which include car emissions
If the polar ice caps melt entirely, 11 of America's largest cities will be gone
However we can slow down the process of global warming by reducing our auto emissions
Use eco-friendly forms of transportation that don't pollute!
Sources:
http://www.abe.ufl.edu/~chyn/age2062/lect/lect_29/40_17.GIF
http://drake.marin.k12.ca.us/academics/rock/bears_files/polar-ice-caps-melting.jpg
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