Physics

Global warming refers to an increase in the Earth’s average temperatures. It is largely attributed to the greenhouse effect, an easily observable scientific phenomenon whereby certain gases in the atmosphere trap energy from the sun. Infrared insolation (solar radiation) enters the atmosphere and is about 92% absorbed by “greenhouse gases,” primarily carbon dioxide, nitrous oxide, methane, and water vapor. Thus, heat builds up in the earth’s atmosphere. (A greenhouse enables plants to grow even in cold weather because glass performs this same “trapping.”) The greenhouse effect, by itself, is not a bad thing; in fact, it is necessary for life. Otherwise the planet would be too cold.