Global Warming 2 --

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and perfluorocarbons. These gases are generated a number of human activities such as fossil fuel combustion, waste disposal in landfills, the
use of a refrigerator, numerous agricultural and industrial activities, and the cutting down of numerous forests.
These human practices have already changed the chemical make up of the atmosphere. Between the pre-industrial times and today, we have seen the concentration of carbon dioxide rise 30% in some regions, in particular the northern hemisphere, human practices have increased concentrations of aerosols in atmosphere, which is a traditional form of air pollution), which tends to cool the atmosphere.
With all these gases in the air, it is starting to change the Earth's climate. The temperature of the Earth's surface is as warm, if not warmer than it has been in any other century since at least 1400 AD. The temperature over the past century has risen
one degree Fahrenheit over the last century. These last few decades have ...

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