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Originally Posted by jfuh  I hope this is not a waste of time where you're just going to give me some nonsense response.
All too easy for before man walked the earth.
#1 atmospheric composition was not the same as it was then.
#2 orbital wobbel known as Milankovitch cycles.
#3 solar output cycles
So you have no problem with the fact that the world is indeed warming.
Fair enough that saves me time from proving that it is warming.
Then the rational is quite simple.
1. Solar output has been steady we are not at any point where there has been any observed change in solar output directly or indirectly. The sun does have 11 year maximum minimum sunspot cycles but earth's circulation and ocean currents buffer out any radical changes
2. We are not wobbeling any closer to the sun nor have we been in the last 200 years since the Industrial revolution.
3. Though volcanic eruptions do indeed release huge quantities of greenhouse gases they also release huge quantities of particles that reflect radiation back into space and actually cool rather than warm. AS well as the fact that anthropogenic output far exceeds that of planetry volcanic systems.
4. Nature emits orders upon orders of magnitude more in greenhouse gases than human beings ever produce, however, natures emissions are in equilibrium - IOW carbon neutral and can be observed in the carbon cycle.
Eleminated solar, stellar and all natural impacts on global climate for the last 200 years (where we see the warming).
By process of elimination look to your left and see the 5ton elephant in the corner. Anthropogenic sources.
Elimination not enough? Ok
Anthropogenic emissions are NOT in equilibrium with the environment. They are a net addition to what nature already produces. Planet is able to buffer out fast dramatic changes but over the course of time with incriments of greenhouse gases continuing what we see are an un-ignorable trend of the concentration of greenhouse gases coinciding precisely with temperature incriments.
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I didn't say you did, I specifically said it seemed that you are eluding to.
But since that is not what you are saying then what relevance does bringing up that "other nations pollute worse than we do" have on the argument whatsoever? I hope you're not reaching for a tu quo quoi argument here. |
None of what you posted here can prove the case for "man" caused global warming. In order to PROVE that it is man caused, one must then explain why there have been at least four major ice ages in the Earth's past with corresponding heating and melting long before man walked the earth.
All I am asking for here is some intellectual curiosity and explanation of how this all has occurred many times in the distant past without man?
So please explain to me the CO2 levels and warming that have occurred four times in the past and the global cooling that resulted in ICE ages four times in the past according to scientists; and then explain how they occurred without man's involvement and how this time it involves them.
The FACT is that we have been part of a warming trend from the last ice age which started over 10,000 years ago.
Sidebar: I was just on a camping visit to Yosemite Park. They tell me it was formed when the ice sheets and glaciers carved the valley out, then retreated.
NOTE: They retreated long before man walked the earth.
Ice age - Wikipedia, the free encyclopedia The earliest hypothesized ice age, called the Huronian, was around 2.7 to 2.3 billion years ago during the early Proterozoic Eon. The earliest well-documented ice age, and probably the most severe of the last 1 billion years, occurred from 850 to 630 million years ago (the Cryogenian period) and may have produced a Snowball Earth in which permanent ice covered the entire globe. A minor ice age, the Andean-Saharan, occurred from 460 to 430 million years ago, during the Late Ordovician and the Silurian period. There were extensive polar ice caps at intervals from 350 to 260 million years ago, during the Carboniferous and early Permian Periods, associated with the Karoo Ice Age. Since then, the world has seen cycles of glaciation with ice sheets advancing and retreating on 40,000- and 100,000-year time scales called glacials (glacial advance) and interglacials (glacial retreat). The earth is currently in an interglacial, and the last glacial period ended about 10,000 years ago. All that remains of the continental ice sheets are the Greenland and Antarctic ice sheets.