The Ultimate Puzzle

There’s a lot of theories out there about what causes global warming. Theories range from far-fetched arguments such as aliens (those from space not other countries), to cows, to agriculture, to human reliance on fossil fuels, to our increasing population, to the building and maintaining of large cities and everything in between. Even among scientists who agree that global warming is real there seems little consensus as to the causes. Most claim that the addition to CO2 from human actions do play a part as well as cities where sidewalks and buildings increase the temperature in areas as much as 10 or 12 degrees Fahrenheit over less populated places.

Source: Solar Energy Home

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