Paul98 wrote on Mar 11th, 2009 at 5:32am: The tide of scientific debate is turning. The term "Global Warming" has already morphed into "Climate Change" because the evidence for man made global warming is unsound.
No, that is a ridiculous claim. There have always been a variety of terms - greenhouse effect, hot house effect, global change, global warming, climate change, etc. The fact that one of these is used more often than another does not signify anything about the evidence or science. That is like saying that the reason that race relations in America changed is because people switched from using the word 'negro' to 'colored' to 'black' to 'African American'. At best, such changes in the languages reflect slight changes in perception. Language changes all the time.
The term climate change has become more popular for several reasons. The changes that are predicted involve more than warming - the tropics will see more rain, while many temperate areas will see an expansion of deserts. Using the word 'climate' also emphasizes the fact that the changes are long term and on average ... many in the general populace hear other terms and assume there will be a constant, even warming everywhere, which is not what the climatologists intended to communicate. The term 'warming' gives some people a warm fuzzy feeling; that is an obvious mis-communication if someone is concerned about sea levels rising several feet, or reduced food production when the human population is headed to ten billion.
Paul98 wrote on Mar 11th, 2009 at 5:32am: More and more scientists are coming forward to dispute man is the driving force behind global warming.
Well, the minority of scientists who think that humans can have no effect on climate are getting better organized and more vocal, but that is due in no small part to economic and political support (as others have pointed out in previous posts).
And that statement attempts to frame the debate in terms of a straw-man argument. Most climatologists do not say that man is the 'driving force' behind climate or climate change. A more reasonable position is that that burning fossil fuel that took millions of years to accumulate in a century or two will pump up the carbon in the atmosphere, and this will cause heat to be retained in the atmosphere, which will change the climate, leading to a variety of consequences (many of which are rather negative).
Paul98 wrote on Mar 11th, 2009 at 5:32am:Evidence is emerging from core samples and other paleo-climatic studies that show CO2 increase lags the warming periods the earth has seen and is in fact a result of warming, not the cause. We are still coming out of an ice age that peaked 1,000s of years ago.
This lag does not disprove the simple, testable hypothesis that carbon (CO2 and methane and chlorocarbons) increase heat retention in the atmosphere (which is undoubtedly true). It does negate the observation that CO2 and methane levels are rising due to human activity. There is no reason to assume that these changes will not lead to increased heat retention in the environment. The only valid scientific questions are how much, and how fast.
The fact that there has been a variable lag between CO2 and temperature in the historical record only proves that there is multiple causation in a complex system. The fact that one cause is sometimes a secondary cause does not mean that it cannot be a primary cause under other circumstances - like the rapid release of carbon that was accumulated over millions of years.
10, 50 and 100 million years ago, human contributions to erosion were insignificant. That historical record does not mean that human impacts on erosion today can be ignored - in most places, where there are people, the accelerated erosion is tied to human affairs. That does not mean that soil conservationists deny the fact that erosion can be a natural process.
CO2 lags do not disprove the idea that human activity is leading to climate change; this argument has been discussed and dissected at length; it is not true. Here is one good article on that:
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