Hard evidence to support an analogy is sort of impossible, and the word "sensitive" is actually totally subjective and based on perspective, so I will respectfully ask you to ignore it.
Concurrently, you are right, I view the earth in that manner.
Here is a PowerPoint presentation you can look which is actually quite interesting. I could send you the actual document if you want to go through it not in adobe. Page 6 is a graph of ice corps that show that balance I am talking about.
http://bfsd.server.enovum.com/en/index.php?option=com_docman&task=docclick&Itemid=72&bid=72&limitstart=0&limit=20
Thanks.
I looked at the power-point. I'll print it out this evening, collect some new information and respond.