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50 degrees is common.

Sorry but no, not in Antarctica. Did you look up the location of McMurdo Station? Is is near the sea. As I said earlier, warmer temperatures occasionally occur there near the sea. They do not occur further inland. If you are going to continue to claim that they do then back it up.

You also seem to think that the earth must be warm at its surface. I'm just boggled by this. People who have studied glaciers across the world have observed that some of them are frozen right to the bottom. It's not hard to find info on this:

http://www.ingentaconnect.com/content/bpl/geoa/2000/0000082a/F0020002/art00129
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This basal sediment is frozen onto the glacier base in a lacustrine environment, rather than resulting from wet-based conditions. The implication is that the nearly identical Bonney hummocky moraines in central Taylor Valley likewise result from downvalley expansion of a frozen-based Taylor Glacier into its proglacial lakes.

This is an example of basal flow, explained earlier, which you will find in places that are cold right down to the ground. What's more, the ice tends to keep the ground cold. I suspect this may be part of what is meant by the term "feedback mechanism" though this is going to take a little research. I'll invite you again to do some yourself, rather than continuing to repeat the same baseless erroneous claims.

What exactly are you trying to show here?