Wednesday, February 01, 2006
A Global Warming Worksheet
As used by the media, "global warming" refers to the theory not only that the earth is warming, but doing so because of human industrial activity.
"But even if a change is measured, how do we know it's manmade? Giant, mile-thick sheaths of ice have come and gone from North America in recent millennia. In our unstable and evolving planet, temperature is often either rising or falling. Who knows whether a trend is the product of human activity or natural?
The answer is nobody. All we have is hypothesis.
Nobody doubts, for instance, that when Bill Clinton asserts global warming is the greatest threat to mankind, he's consulting not the science but a purported "consensus" of scientists. A layman asks himself: What can "consensus" mean if it asserts a judgment nobody is equipped to confidently make?"
"But even if a change is measured, how do we know it's manmade? Giant, mile-thick sheaths of ice have come and gone from North America in recent millennia. In our unstable and evolving planet, temperature is often either rising or falling. Who knows whether a trend is the product of human activity or natural?
The answer is nobody. All we have is hypothesis.
Nobody doubts, for instance, that when Bill Clinton asserts global warming is the greatest threat to mankind, he's consulting not the science but a purported "consensus" of scientists. A layman asks himself: What can "consensus" mean if it asserts a judgment nobody is equipped to confidently make?"
