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Just a small note to my comments above.

Glaciologists study the rate at which ice flows in different places. It flows at different rates in different places. The climate is different in different places.
Is is is. But the past is about was was was. The old saw about "the present is the key to the past" is showing its age. Surely if the political movement supported by these findings is correct, conditions are very much subject to change.

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Scientists are aware of these rates when they drill ice cores.
The author of your pdf article was aware that the annual rate was "aware" that the rate was 7 ft. per year. Yet he said "Add to these melt layers the actual annual layers, which near the top show up as several lines within the space of a few inches, ..." Just what good does this kind of awareness do them?

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson