As I understand it, the consensus among scientists is that global warming is real. In fact, there is little dispute on this issue. The EPA, for example, says that the temperature of the Earth has increased by about 1.2 to 1.4 degrees Fahrenheit in the last 100 years. This is not really in dispute.
What is disputed is WHY this is happening. Most scientists believe that the warming is coming about due to human activity. Specifically, they believe that it is caused by the release of "greenhouse gasses" into the atmosphere.
Howeber, many people do not believe this. They argue that the increase in temperature is a natural occurrence. The Earth's temperature has changed at times in the past (giving us ice ages, for example) and people argue that it is simply doing this again.
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