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It's true that we don't know all from climate.
Originally posted by astrocreep
There have been numerous times in the past when Earth's Climate has been warmer and colder than present by a good degree. No one knows yet just what mechanisms guide it but its suspected that several combined do it.
It just happens to be that most of CO2 increase has happened after industrial revolution.
One important fact that the global warming crowd will have you believe is that the rise in CO2 caused the warming when in reality, it actually gradually rose in response to a 300 year warming trend after the end of the last "Littel Ice Age". Warmer Earth means less Ice and more production of CO2 by inhabitants.
Given all the new ice core data, what changes can we anticipate for our climate? If CO2 has increased over the past 150 years as much as it normally increases over thousands of years leading up to an interglacial phase (about 80 ppmv)...
www.daviesand.com...
The multinational team reported its findings in the June 3 issue of the journal Nature.
Petit and colleagues found carbon dioxide levels rose from about 180 parts per million during each ice age's height to 280-300 ppm in the subsequent warm periods -- far below the current CO2 levels of 360 ppm.
Methane levels, meanwhile, rose from 320-350 parts per billion during the icy interludes to 650-770 ppb during the warm spells. Current methane levels are 1,700 ppb.
www.climateark.org...
The lessons from the Vostok ice core can be summarized as follows. Past changes in greenhouse gases have been initially triggered by climatically induced changes in the oceanic and terrestrial pools or reservoirs of carbon Changes in these pools of carbon resulted in the amplification of the original weak, orbitally-driven changes in the amount of solar radiation reaching the Earth's surface. Once in the atmosphere, greenhouse gases then played an important role as amplifiers of climate change, accounting for about half of the global warming observed in the Vostok ice core, corresponding to the four glacial-interglacial (cold-warm) climate transitions. The main difference between the Vostok record of climate change and the present climate situation is that today the sharp increase in greenhouse gases (i.e., approaching unique levels of greenhouse gas concentrations relative to the last 420,000 years of climate change) is being triggered by human activities at an unprecedented rate. In addition, ice-core records (and other records) of past climates indicate that changes in the concentration of greenhouse gases, whatever the causes, induce important global climatic changes. By comparison, society's impact on the concentration of greenhouse gases during the last 150 years has already enhanced the CO2 concentration of the atmosphere by an amount equivalent to the glacial-interglacial CO2 increases documented in the Vostok ice-core records described above.
www.usgcrp.gov...
What role does human activity play in global warming?
The atmosphere of the Earth is like a blanket that traps heat. It keeps the temperature at the surface warmer than it would be otherwise, which is great because it makes the world a pleasant place to live. But humans have been adding to the gases that help trap this heat.
We've been adding to the stock of carbon dioxide in the atmosphere by taking coal, oil, and natural gas out of the ground and burning them as fuels. Combined with deforestation, this has raised the concentration of carbon dioxide in the atmosphere by about one-third since pre-industrial times.
And what does this do the welfare of the Earth?
If you think of an automobile engine—when you step on the accelerator, the engine speeds up because you're putting more energy into it by increasing the fuel flow, so everything runs harder and hotter and faster. The extremes get more extreme.
That's what's happening with the climate. We're stepping on the accelerator by adding greenhouse gases to the climate and increasing heat energy in the system.
Certainly the climate has, to some extent, a mind of its own. But that's not to say we're not having an influence on what the climate is, what it does, and how it behaves.
We've taken a great deal of carbon that used to be locked up in the Earth in the form of coal and undisturbed oil and natural gas and released it into the atmosphere. That carbon hadn't been there in the atmosphere for millions and millions of years.
It's simply naive to think that's not going to have an effect on the climate.
news.nationalgeographic.com...
Originally posted by E_T
It just happens to be that most of CO2 increase has happened after industrial revolution.