Global Warming

1. Causes
2. Effects
3. Controversies

Green house gases are the main cause for global warming. The four green house gases are Carbon Dioxide, Chlorofluorocarbons, Methane, and Nitrous Oxide.

The effects of global warming are predicted using computer models. It predicts that by 2030 the temperature will increase by 2 to 4 degrees Fahrenheit. This change in temperature can cause a major change in agricultural areas. Also, higher temperatures will cause rising sea levels.

A new poll states that only 57% of Americans think the global temperature is rising, which is a drop of 20 points compared to 3 years ago. Out of the 57% only 36% believe that human activities are behind global warming. Although many people believe global warming is a myth, Half the poll respondents support limits on greenhouse gases.

http://www.dailymail.co.uk/news/worldnews/article-1222510/Poll-U-S-belief-global-warming-cooling-down.html