Quote:
Originally Posted by brillser |
pretty interesting....but knowing the way folks are around here, the first thing that caught my eye was that the article had very few sources.....so it could easily be construed as the spin of the environmental defense fund....which, as everyone knows

....is just another liberal apologist organization
or, at least, it says crazy stuff
like human are responsible for global warming.....
the article did link to the edf's in depth report on those myths, tho...so i followed along and and found this
Quote:
MYTH #6: The amount of carbon dioxide (CO2) generated by human activities is much
smaller than natural sources; therefore, human activities cannot be responsible for the
large observed increase in atmospheric CO2 over the past few centuries.
FACT: It is undisputed that humans are entirely responsible for the increase in
atmospheric CO2 over the past few centuries. In pre-industrial times, large natural
sources of CO2 were balanced by equally large natural removal processes, such as
photosynthesis in plants, maintaining a stable level of CO2 in the atmosphere for
thousands of years. Human-produced emissions, though smaller than natural
emissions, upset this balance. Because human-produced emissions aren’t completely
absorbed by natural processes, they accumulate in the atmosphere, increasing the
concentration of CO2 (McElroy 2002). http://www.edf.org/documents/4418_MythsvFacts_05.pdf |
which pretty much just restated what the article you linked to layed out.....except it sourced this McElroy character....so i googled him
OMG....he's a SCIENTIST!!!!!

and not just some johnny come lately -one of those so often dismissed in this thread as a scientist looking to further his reputation, or grab up some grant money.....or something else the bloggers can sink their teeth into.....
the man actually has got some info....about 3/4 of million years worth of info
Quote:
McElroy is among the scientists who since the 1970s have been using paleoclimatic data to chart changes in the earth's atmosphere. To obtain these data, researchers drill several kilometers down into polar ice sheets and extract gases from the tiny air bubbles trapped inside.
Through these, says McElroy, "you can not only infer a surrogate for temperature,
but you can also measure the composition of the atmosphere at that point in the earth's
history. There is a close association between climate and the level of gases like CO2
and methane." http://www.hno.harvard.edu/gazette/2...alwarming.html |
so when your article goes on about
Quote:
People are causing global warming by burning fossil fuels (like oil, coal and natural gas) and cutting down forests. Scientists have shown that these activities are pumping far more CO2 into the atmosphere than was ever released in hundreds of thousands of years. This buildup of CO2 is the biggest cause of global warming. Since 1895, scientists have known that CO2 and other greenhouse gases trap heat and warm the earth. As the warming has intensified over the past three decades, scientific scrutiny has increased along with it. Scientists have considered and ruled out other, natural explanations such as sunlight, volcanic eruptions and cosmic rays. (IPCC 2001)
Though natural amounts of CO2 have varied from 180 to 300 parts per million (ppm), today's CO2 levels are around 380 ppm. That's 25% more than the highest natural levels over the past 650,000 years. Increased CO2 levels have contributed to periods of higher average temperatures throughout that long record. (Boden, Carbon Dioxide Information Analysis Center)
As for previous Arctic warming, it is true that there were stretches of warm periods over the Arctic earlier in the 20th century. The limited records available for that time period indicate that the warmth did not affect as many areas or persist from year to year as much as the current warmth. But that episode, however warm it was, is not relevant to the issue at hand. Why? For one, a brief regional trend does not discount a longer global phenomenon.
We know that the planet has been warming over the past several decades and Arctic ice has been melting persistently. And unlike the earlier periods of Arctic warmth, there is no expectation that the current upward trend in Arctic temperatures will reverse; the rising concentrations of greenhouse gases will prevent that from happening.
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it's coming from the horses mouth....or the earth's ice....or someplace above reproach.
and so.....
what strikes me is the whole idea of a tipping point....prior to man's industrial civilization, the earth's natural systems tended to balance everything out.....which is not to say they couldn't be thrown out of wack by cataclysmic volcanic eruptions, for example, spewing an inordinate amount of junk into the atmosphere, and altering the climate suddenly, dramatically, and extensively....but eventually, the natural systems would restore a balance.....
the point now is that there is a new, significant player (us)....something else for mother earth to deal with....and if we just thumb our noses at our significance, things are not gonna get any better anytime soon.