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Because of the discord in the scientific community, santa pig pattern full printing christmas ugly sweater the CAA has commissioned federally sponsored studies to investigate the relationship between air pollution, acid rain, and the global climate.

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Humans depend on water for drinking, cooking, swimming, fishing, and farming. Discharges of organic wastes, heated water, nutrients, sediments, toxic chemicals, santa pig pattern full printing christmas ugly sweater  and other hazardous substances can all make water unfit for human use. Organic wastes, produced by animals and humans, decompose through the use of oxygen. If a body of water spends too much oxygen during the decomposition of organic wastes within it, certain types of fish will not survive. Aquatic life can also be harmed by the discharge of heated water into lakes and streams, because the increased temperatures accelerate biological and chemical processes that reduce the water’s ability to retain oxygen.

The CAA has also commissioned federally sponsored studies regarding the relationship between air pollution and the destruction of the ozone layer. The ozone layer shields the earth from the harmful effects of the sun’s radiation, and may be depleted by the release of chlorofluorocarbons into the atmosphere. CFCs serve as a coolant for refrigerators and air conditioners, as a foaming agent for insulation, as a solvent for computer chips, and as a propellant for aerosol products. The CAA bans nonessential uses of CFCs, but leaves room for judicial interpretation as to what the phrase nonessential uses might mean. Scientists also disagree about whether air pollution can influence the global climate. Some scientific studies conclude that air pollution has caused the average temperature on earth to increase during the last twenty-five years or so, resulting in a condition called global warming; some conclude that the average temperature has decreased, resulting in global cooling. Other studies indicate that the global climate remains unaffected by air pollution and will continue to do so.