Roadbridge,
Man, I hear the "bury their heads in the sand" slam often in this thread. I don't think that anyone participating in this forum actually falls into that category.
If I say "the 'science' behind this debate is flawed, and has been rife with outright fraud" I say it because that is what my review of the literature points to. If you disagree, I could say you have your head in the sand, but I won't.
If I say that the last ice age ended toward the end of the 1800's and that the record in the glacial ice suggests that there are several cycles documented where an ice age ends, the earth heats up steadily for many years to a peak, then cools until the next ice age begins.
The last time this happened it was called "The Renaissance" because the global warming had reduced the effort required to feed the population and enabled more effort to be applied to creativity and scholorship. In the period leading up to the Renaissance the population of mankind on the earth was very small compared to today, and the amount of carbon burned per capita was insignificant. The earth stil warmed and agricultural techniques evolved.
The climate does change. The glacial record is very clear on that. Where the discussion gets very murky is determining the impact of man on that change. The argument has been made several times above that the methane released from biological processes (termite mounds and cow farts are big sources mentioned) is a huge quantity that could dwarf the impact of man-made sources. Frozen vegtable matter in Alaska will eventually thaw (with or without our contribution) and release more CO2 than the average volcano. Oh yeah, volcanos are huge sources of "greenhouse gases" that will happen with or without our burning carbon products.
The changes in crop choices over 20 years are interesting, but the fact that these selections have changed does not necessarily prove that mankind burning carbon products was a contributor to the climate change that has been observed.
The Koyoto discussion is very much an arrogant assumption on the part of mankind that our trivial activities are the only possible cause of global change. There are local impacts that clearly seem to be man-made (but I wouln't be surprised if the occasional temperature inversion in the Los Angeles basin caused dinosaurs to cough and have their eyes water), but the proof that these effects are even regional is very tenous.
As my previous signature said "the plural of anecdote is not data". Observations and anecdotes are important indicators that something is hapening, they are not indicators of the root cause of those events. Personnaly, I'll keep my head in the sand of scientifically verifiable, reproducable facts and data. Pulling it out into the slime of the popular media is just too ugly.
David Simpson, PE
MuleShoe Engineering
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