Hot house earth (2)
Nevertheless, most scientists agree that the accumulation of carbon dioxide has reached the point where an increase in temperature is sure to take place. One study said average global temperatures probably would rise nearly four degrees by the twenty first century a total warming greater that that since the last ice age.
Rising temperatures would be just the beginning. The heating would shift global rainfall patterns, wholesale replica designer handbags, bringing drought to some now fertile areas and irrigating some deserts. Like wise, mountain glaciers and polar ice caps could melt substantially, causing the seas to rise two feet by the end of the entury. Many low lying communities could bo flooded. Worst of all, the effect may be irreversible.
Some have maintained that the world faces such great dangers from population growth, diminishing food supply, and the spread of nuclear weapons that the green house threat seems mild by comparison. Others argue that since the earth has endured a long string of ice ages in the last two million to three million years, wholesale designer handbags, any warming is likely to be temporary. Even so, those who try to minimize the problem must also explain way the harsh conditions on the planet venus. There, a runaway greenhouse effect is thought to account for surface temperatures approaching 900 digress Fahrenheit’ Venus’s cloud-shrouded atmosphere is about 97 percent carbon dioxide.
Although few scientists think the earth will to the way of venust. Most agree that the greenhouse problem should be tackled now. City planning should be revised; wholesale coach handbags and reservoirs should be built; an eye should be kept open on the thermometer for the first definite sing that the greenhouse era has arrived.
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