There is also the theory of Gravity.
While it works, it is yet not explained.
Now Brenjen, give me the better explanation of that coolness in 1816 (similar occurance after Krakatau as far as I remember). Then excercise your mind on the radius of fallout (thickness and distance) and tell me it had no effect. Funny that those scientists ever brought up terms like "global dimming" and the cooling effects therefrom. Funny that the shade of the night cools the air. And while at it, please discard the effects of the Laki eruption, and the funny N-Hemisphere cooling occuring swiftly after and lasting for some years. The fog, the sulphur...nothing, yes?
In your world, if you shade your room from the sun, it probably doesn't cool.
And if you open the curtains, it doesn't warm?
And if you replace the window glass with a mirror, then what?
And if you buy a special "K" glass for your window, then what?
All theories of course
Except the truth of global warming, from your source, - or theory:
"This is a naturally occurring shift". In your own words. So I know your park.
A natural occuring shift, thereby no human impact. A little off the cycle perhaps? Or is it a 20 million years swing?
Anyway, in my readings, this all becomes more interesting. From my friend W:
"[edit] Ice shelf disruption
In the last several decades, glaciologists have observed consistent decreases in ice shelf extent through melt, calving, and complete disintegration of some shelves.
The Ellesmere ice shelf reduced by 90 percent in the twentieth century, leaving the separate Alfred Ernest, Ayles, Milne, Ward Hunt, and Markham Ice Shelves. A 1986 survey of Canadian ice shelves found that 48 square km (3.3 cubic kilometers) of ice calved from the Milne and Ayles ice shelves between 1959 and 1974.[1] The Ayles Ice Shelf calved entirely on August 13, 2005. The Ward Hunt Ice Shelf, the largest remaining section of thick (>10 m) landfast sea ice along the northern coastline of Ellesmere Island, lost 600 square km of ice in a massive calving in 1961-1962.[2] It further decreased by 27% in thickness (13 m) between 1967 and 1999.[3] In summer 2002, the Ward Ice Shelf experienced another major breakup. [4]
Two sections of Antarctica's Larsen Ice Shelf broke apart into hundreds of unusually small fragments (100's of meters wide or less) in 1995 and 2002.
The breakup events are linked the dramatic polar warming trends that are part of global warming. The leading ideas involve enhanced ice fracturing due to surface meltwater and enhanced bottom melting due to warmer ocean water circulating under the floating ice."
This is this century from the polar areas. Notice the words "dramatic polar warming".
And the counter...the dimming, from W:
"Global dimming
Main article: Global dimming
Scientists have stated with 66-90% confidence that the effects of volcanic and human-caused aerosols have offset some of global warming, and that greenhouse gases would have resulted in more warming than observed if not for this effect.[1]"
I trust W better than Brenjen. W also has that nice one:
Here is more from W:
http://en.wikipedia.org/wiki/Retreat_of_glaciers_since_1850Pic:
Tough to call it a theory when the measures come that close, as well as the old photos and the tales of your great-grandfather....
So, what proof is there for me? Maybe you can get a grant for proving the 2 items for me:
1: Globe is not warming
2: If it is, it's such a normal cycle that any human factor is eliminated.