There are several models using the scientific method used to measure and support the concept of global warming. Scientists are measuring items that have remained on Earth for millions of years, such as the ice core samples, but they are also measuring tree rings and other living indicators of the Earth's temperature. Scientist Johansen continues, "By 1998, the Earth had sustained 20 consecutive years above the 1961 to 1990 average temperature, with the upward curve steepening toward the end of the period" (Johansen 34). This has continued into the 21st century at an even steeper rate, and the scientific evidence points to even greater warming in the next decades.

The bottom line on global warming is that people need to take it more seriously. It seems that many people still do not understand the reality of global warming, and that if the planet continues to warm the way it has...
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