global warning

Essay by bodmon January 2013

download word file, 5 pages 0.0

Global warming endangers the delicate world we live in by altering climate, elevating sea levels, and damaging ecosystems. Global warming is commonly referred to as an increase in the temperature of the lowest layers of Earth's atmosphere. Global warming has occurred in the distant past as the result of natural influences, but the term is most often used to refer to the warming predicted to occur as a result of increased emissions of greenhouse gases. Primary greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Carbon dioxide, as well as other greenhouse gases, is a very important factor in the vital cycles which sustain life on this planet: plants use CO in photosynthesis and release oxygen necessary to maintain the lives of animal species, who through exhaling return CO in atmosphere, completing the cycle. Greenhouse effect is a natural process which made life on Earth feasible.

Our planet's surface temperature would have been 33 degrees Celsius cooler, -18 C instead of present 15 C, if not for naturally occurring greenhouse gases.

Science brings different theories about the primary causes of the global warming of atmosphere. Eventually, the processes that happen in the environment are so complex even on local scale, that analyzing causes and effects of global processes (e.g., global warming) leads scientists to controversial conclusions. Most scientists agree on certain facts. Arguments start upon interpretation of these facts. Concentration of atmospheric carbon dioxide, which the scientists agree determines the temperature of Earth, has increased from a value of about 275 parts per million before the Industrial Revolution to about 360 parts per million in 2005. The rate of increase has also been accelerating in this period of time. The researches made by different groups of scientists came nearly with the same results on the rise...