Hot house earth (1)
Headlines warned of rising temperatures and melting polar ice cap.
Scientists issued reports on the severe climate changes that could result from the :greenhouse effect”, the gradual warming of the atmosphere caused by an increase in carbon dioxide levels from the burning of fossil fuels, saying that average global temperatures could start to rise within a few decades and reach levels nine degrees Fahrenheit higher than today’s temperatures by the end of the next century. This, experts said, could create dangerous changes to global weather patterns. For instance, it could change annual amounts of rain fall, swell or dry up rivers, and raise the level of the seas.
While admitting that this forecast was some what uncertain, wholesale replica designer handbags, scientists warned against treating it as a cry of wolf. Although there is considerable debate over how wevere the greenhouse effect will be, one thing seems certain: carbon dioxide levels are on the rise.
Who or what is to blame? Scientists conclude that it is the brrning of coal, oil, synthetic fuels, and natural gas. These fossil energy sources release an estimated five and a half billion tons of carbon into the atmosphere each year as colorless, odorless co2 gas.
The increased carbon dioxide could profoundly affect the way the earth is heated by the sun. the sun’s energy strikes the earth mainly in the form of visible light. As the earth heats up, wholesale designer handbags, it radiates this energy back into space, but at the much longer wavelengths of infrared light, or heat. Carbon dioxide lets the visible light pass through, but absorbs energy at infrared wavelengths. Thus, the more carbon dioxide there is in the atmosphere, the more the earth’s heart is blocked from escaping, wholesale coach handbags, just as a blanked holds in the heart of a sleeper’s body. In the late 1800s, a Swedish scientist gave this phenomenon its name when he comported it to the way glass shuts in air heated by the sun in a greenhouse.
Some scientist’s think the greenhouse effect already has begun: average global temperatures have risen about one degree Fahrenheit in the past ninety years (with a dip form the mid 1940s to 1970). Others argue that the rise could be due to natural temperature ups and downs.
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