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If the world warms by four degrees oceans will rise and glaciers will disappear, cutting off fresh water to billions.

Six Degrees Could Change the World :
SUN FEBRUARY 10 8P et/9P pt : http://c...

If the world warms by three degrees the Mediterranean and parts of Europe will wither in the summer's heat.

Six Degrees Could Change the World :
SUN FEBRUARY 10 8P et/9P pt : http://channel.nat...

If the world warms by two degrees, some of the changes to the biosphere are no longer gradual.

Six Degrees Could Change the World
Sunday, February 10 8 PM et/ 9 PM pt
http:/channel.nationalgeograp...

If the world warms by six degrees, oceans will turn into marine wastelands and natural disasters become common events.

Six Degrees Could Change the World :
SUN FEBRUARY 10 8P et/9P pt : http://...

If the world warms by five degrees the planet reaches a nightmare vision of life on Earth as traditional social systems break down.

Six Degrees Could Change the World :
SUN FEBRUARY 10 8P et/9P ...