Everyone is aware that the definition of global warming is a significant increase in the Earth's temperature over a short period of time due to the result of human activities. An increase in temperature of 0.4° Celsius is significant over a century, and an increase of 1° Celsius is considered global warming. Although 1° or 2° Celsius may not seem like a lot, small temperature changes can have significant effects. When you hear the term "ice age," you probably think of the world covered in snow and ice. Ice ages occur every 50,000 to 100,000 years, and the average global temperature was only 5 °C cooler than they currently are [4, 5, 6].

The Intergovernmental Panel on Climate Change (IPCC) is a group of over 2,500 scientists from countries across the world that met in 2007 to advance climate research. One of the conclusions of this meeting was that the last 15 years have been the warmest since 1850. Some of their observations were that glaciers and snow have decreased in the northern and southern hemispheres, and average arctic temperatures have increased by twice the global average during the last 100 years. Rain has increased in the Americas, northern Europe and parts of Asia, and South Africa and the Mediterranean have been experiencing drying trends. Overall, hot days globally have become more frequent, and cold days have become less frequent and severe [4 - 7].

Natural changes in climate such as heating due to volcanic activity, radiation from the sun, and changes in the chemistry of the atmosphere sometimes take thousands of years to change only 1 °C. The current carbon dioxide concentration (CO2) determined from the ice cores (180 to 300 ppm) is far greater than the natural range found over the last 650,000 years. If the CO2 concentration rises to 400 - 440 ppm and stays there, the eventual rise in temperature would be around 2.4 - 2.8 °C [4 - 7].

In order to stabilize the CO2 level, it needs to peak, and then decline. The more quickly that this occurs, the lower the peak stabilization level. According to the IPCC, in order to stabilize the CO2-equivalent concentrations around 445 to 490 ppm, CO2 emissions would need to peak by 2015 (at the latest), and then fall to between 50 - 85% below the year 2000 levels by 2050. A later peak and higher concentrations would lead to larger increases in temperature.

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