arbon dioxide, making it an important greenhouse gas despite its relatively low concentration (Murck, et al., 490). There have been many studies on how methane releases into the atmosphere. Some methane in the atmosphere is generated by biological activity related to the digestive process of domestic livestock, especially cattle. Burkhard Bilger, the author of Global Warming, states, "Since one cow emits a half pound of methane a day and there are 1.3 billion cattle in the world, more than 100 million tons of methane are released each year into the air" (50).
             Another potentially devastating environmental effect of global warming is that higher temperatures lead to changes in climate, particularly in water cycles. Places experiencing warmer temperatures will most likely have an increased amount of evaporation from lakes, rivers, and oceans. In the northern regions of the United
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