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| | Return to [[History 8 Human Origins Concepts]] | | Return to [[History 8 Human Origins Concepts]] |
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| − | '''''From the Text: ", periodic variations in the earth’s orbit and constant shifts in the shape of the world’s continents combined to produce a perpetually fluctuating climate, alternating approximately every hundred thousand years between ice ages and warmer intermediary periods known as interglacials.'''''
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| − | '''''During the interglacials, such as the one the earth is enjoying today, the equatorial regions experienced abundant rainfall, while the northern and southern parts of the world experienced relatively temperate climates. However, each interglacial gradually grew colder, and the ice spread southward until it covered large parts of Europe and North America. Northern Asia became bitterly cold, but lack of rain kept it free of ice. Then after a few thousand, or sometimes just a few hundred years, this glacial period reached its peak and quite suddenly was replaced by a new interglacial, and the cycle began again. RB'''''
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| − | Climate change has already had some observable effects on the environment. Glaciers have sunk, ice on rivers and lakes have broken up earlier, and plants are flowering and blooming earlier. Scientists have predicted that glaciers will melt and sea levels will rise. Scientist predict that temperature will rise for decades. We believe that this sudden rise in temperature is due to too many greenhouse gasses that are destroying the ozone layer, the layer of the atmosphere that protects us from the majority of the sun's harmful rays. It is estimated that over the next decade the temperature will rise about 2.5 degrees Fahrenheit. The net damage of climate change however, will rise. In the US areas that experience heat waves, will get more intense longer heat waves. In Europe, the likely hood of flash floods will increase largely and the productivity of crop farms in southern Europe will decrease. In Africa, the costs, specifically the eastern coast will flood more extremely and often. In conclusion, if the human race can not adapt to these changes in our climate, we will deep, deep water.
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| − | Lorn Maxwell McLaren
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| − | Source:
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| − | http://climate.nasa.gov/effects
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Revision as of 17:10, 14 June 2014
Return to History 8 Human Origins Concepts
