There's no simple answer, because the causes are complicated, and their relative importance has changed over time. Man's contribution to the warming trend started to become significant about 1900. From approximately 1940 to 1970, our emis...
http://answers.yahoo.com/question/index?qid=20080822134...
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when did it start the first time or this time? global warming and cooling has gone on for millions of years we have only tracked it for a very very short time.
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answers.yahoo.com/question/index?qid=20080923230131AAig...
answers.yahoo.com/question/index?qid=20080923230131AAiganj
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When did global warming start? The truth is that global warming started long before we realized the affects. It has… ... ; When did global warming start? It’s a frequently debated topic around the world. However one thing is true; global warming has been taking place as a natural cycle for thousands of years.
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www.ways-to-stop-global-warming.com/when-did-global-war...
www.ways-to-stop-global-warming.com/when-did-global-warming-start.html
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Today’s global warming is different for two reasons: ... Climate Classroom > Kids' Questions about Global Warming > Question #3 ... Guidelines for teaching global warming...
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online.nwf.org/site/PageNavigator/ClimateClassroom/cc_k...
online.nwf.org/site/PageNavigator/ClimateClassroom/cc_kids_question3
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Determining When Did Global Warming Start ... The term global warming refers to an increase in temperature of the surface air that surrounds the earth. When did global warming start? Some say records date back as far as 1850. Research has shown that both the air temperature and the temperature of the sea have risen since...
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www.refresharticles.com/articles/weather/when_did_globa...
www.refresharticles.com/articles/weather/when_did_global_warming_start.txt
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Most of the literate world today regards "global warming'' as both real and dangerous. Indeed, the diplomatic activity concerning warming might lead one to believe that it is the major crisis confronting mankind.
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www.cato.org/pubs/regulation/reg15n2g.html
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This Hypothesis is wrong and has been discredited by competent independent scientists. The current 250 years of global warming (started at the end of the little ice age - 1750); 1. Has resulted in one degree warming in the last ...
http://www.roanokeslant.org/GlobalWarmingThoughts/
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As we scramble to change our energy-gobbling ways, some scientists are asking whether global warming might actually be serving a useful purpose. Could it be possible that this warming trend is preventing us from entering another ice age?
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www.howstuffworks.com/question780.htm
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