by Tapas » Sat 30 Apr 2005, 21:23:41
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')Science has no preconceived notions or fantasies. Scientific argument only gets stronger with more debate and facts.
I like your spirit. We all should have a skeptic mind and debate everything till the evidence is strong enough to hold a hypothesis and then further our research, go for independent verification till we have to a theory. This is the way science advances.
What causes Global Warming?Our atmosphere mainly consists of nitrogen and oxygen. These molecules do not heat the atmosphere. The greenhouse effect is caused mainly by carbon dioxide. It traps solar heat. Billions of tons of greenhouse gasses have been spewed into the atmosphere by burning fossil fuels. Burning forests have added to the damage. CO2 levels have gone up by 30% since the Industrial Revolution.
Global warming changes the climate. As climatic cycles get disrupted, they bring in drought, hurricanes and typhoons affecting crop yield. Countless species are forced to migrate. Many ecosystems disappear. Polar ice caps start melting. By 2050 the sea level is expected to rise 5 feet flooding coastal areas. As many as 150 million people living in Bangladesh, Egypt, Holland and India will loose their homes. The sea level may rise by 300 feet if all the ice melts.
The earth's temperature could rise by as much as 10 degrees F over the next 100 years.
Here is an excellent essay that tracks how the scientists tracked CO2 as the key to Climate Change from 1950 to the present.
The Carbon Dioxide Greenhouse Effect$this->bbcode_second_pass_quote('', '
')All through these decades, a few geologists had continued to pursue the original puzzle raised by Tyndall and Chamberlin - had changes of CO2 been responsible for the greatest of climate changes? These were the vast slow swings, lasting tens of millions of years, between eras like the age of dinosaurs with summer-like climates almost from pole to pole, and eras like our own when continental ice caps waxed and waned. There was no consensus about the causes of these grand shifts, and it was nearly impossible to reliably measure the atmosphere many millions of years back. Nevertheless, by the 1980s, scientists turned up evidence that CO2 levels had been elevated during the great warm eras of the past.
A key point stood out. In the network of feedbacks that made up the climate system, CO2 was a main driving force. This did not prove by itself that the greenhouse effect was responsible for the warming seen in the 20th century. And it did not say how much warming the rise of CO2 might bring in the future. What was now beyond doubt was that the greenhouse effect had to be taken very seriously indeed.
I would encourage an intelligent reader to do their own research on the subject of Global Warming.