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There has historically been much more CO2 in our atmosphere than exists today. For example: During the Jurassic Period (200 mya), average CO2 concentrations were about 1800 ppm or about 4.7 times higher than today. The highest concentrations of CO2 during all of the Paleozoic Era occurred during the Cambrian Period, nearly 7000 ppm -- about 18 times higher than today. The Carboniferous Period and the Ordovician Period were the only geological periods during the Paleozoic Era when global temperatures were as low as they are today. To the consternation of global warming proponents, the Late Ordovician Period was also an Ice Age while at the same time CO2 concentrations then were nearly 12 times higher than today -- 4400 ppm.
originally posted by: Grimpachi
New study finds 99.999 percent certainty humans are causing global warming
For those few that are finding it hard to understand the percentage and how that translates it means there is one chance in 100,000 that man hasn't contributed to the warming trend.
Just thought I should explain that a little given some of the replies so far.
For the extreme optimist thats not bad. It is far better odds than say hitting the lottery.
originally posted by: ElectricUniverse
a reply to: tothetenthpower
How can anthropogenic CO2 be the number 1 contributing factor to surface global temperature increase when in the Troposphere water vapor constitutes around 95%-98% of the greenhouse effect? It makes no sense whatsoever, the Troposphere is the atmospheric layer where all surface weather occurs and which affects surface temperatures
That study is not only biased, but is plainly wrong. Do you have any idea how many scientists have come forward to denounce the AGW claim?
To me this study only shows desperation on the part of whomever published it.
Emissions of CO2 from coal, gas and oil combustion and land clearing have 13C/12C isotopic ratios that are less than those in atmospheric CO2, and each carries a signature related to its source. Thus, as shown in Prentice et al. (2001), when CO2 from fossil fuel combustion enters the atmosphere, the 13C/12C isotopic ratio in atmospheric CO2 decreases at a predictable rate consistent with emissions of CO2 from fossil origin.
For any reader that might be unfamiliar with isotopes, a brief explanation is in order. Carbon occurs in three types of atoms: 99% is the most common 12C with six protons and six neutrons in its nucleus, 1% is the slightly heavier 13C with six protons and seven neutrons, and the third isotope, 14C with six protons and eight neutrons, accounts for only 0.0000000001% of carbon atoms. It is unstable with a half-life of 5,730 ± 40 years and, although it is essential for determining the age of organic matter, it plays no further part in our story. All carbon isotopes are chemically identical, they differ only in weight.
However, when different isotopes are involved in biochemical reactions, it is quite common for a “bias” against heavier atoms to come into evidence. One might consider the following analogy: if a rational worker were presented with a pile of stones and told nothing more but to carry half of them up a flight of steps, it is likely that he or she would be “biased” against the heavier stones and that the new pile would contain more smaller stones than the average of the original heap.
Prentice et al. (2001) relies on measurements that clearly show such a “bias” in plants. Specifically, bodies of plants with C3- type metabolisms contain (on average) 99.12% 12C carbon and 0.88% 13C, as compared to the atmospheric ratio of 99% 12C vs. 1% 13C. Prehistoric giant ferns and other plants that carbonized over eons into coal had a C3-type metabolism and therefore combustion of coal introduces CO2 into the atmosphere that contains 0.12% less of the 13C isotope; therefore, if present in sufficient quantities, this would eventually decrease the atmospheric concentration of 13C below 1%. Prentice et al. (2001) makes the claim that such a decrease in atmospheric content of the 13C isotope has in fact been recorded in the Mauna Loa CO2 measurements from 1980 to 2005, and that therefore this must be due to human emissions of CO2 from combustion of fossil fuels.
However, there is a problem. C3-type plants are not extinct; in fact, they make up 95% of the mass of all current plant life!
originally posted by: xuenchen
a reply to: Greven
but scientists love to prove other scientists wrong.
Which means they will lie like dogs on rugs to get big money.
Especially when the U.N. is throwing the party (and throwing the bones).
I bet some might even get carbon credit options !!!!
originally posted by: pikestaff
Strange how the earth is being warmd by humans, yet the Antarctic sea ice is at its highest its ever been since humans stated taking notice of it, North America and Europe both having good awefull winters lately, NO discernible increase in average global temperature for the last 16 years, Who is paying those researchers?
As for CO2, at less that one half of one percent of the atmosphere, just how can it have any effect on the other ninety nine and a half percent (well, just over half a percent) of the atmosphere?
originally posted by: quodlibet
Maybe there's a built-in, self-correcting mechanism that makes the planet eventually go over to the opposite extreme in order to cool it off, so that we might find ourselves in a new ice age in the next few years, and everybody will have to move close to the equator and settle down in the narrow Warm Belt. Since there will be fewer resources, including space, this will lead to terrible wars, the Ice Age Wars. Then the ETs will use their heat rays and melt the ice sheets, and many will worship them as gods, the Fire Gods who saved the world from the Big Freeze.
originally posted by: SonOfTheLawOfOne
First of all, humans are BY FAR, not the largest source of CO2 in this warming period. I suggest you brush up on your carbon cycle reading.
Humans emit roughly 29 billion tons of CO2 per year.
Oceans emit roughly 330 billions tons of CO2 per year.
Plants emit roughly 200 billion tons of CO2 per year.
Plants perspire roughly 200 billion tons of CO2 per year.
originally posted by: amfirst1
a reply to: kx12x
Nice chart... watch the Carbon Credit Government Paid Global Warming Alarmist try to debunk it with more million dollar globalists funded money to push the Global Warming propaganda.