And, the application of some of the proxies in an inappropriate manner???. <a href="http://suyts.wordpress.com/2013/03/14/hockey-stick-found-in-marcott-data/">http://suyts.wordpress.com/2013/03/14/hockey-stick-found-in-marcott-data/</a> And, of course, tree ring studies aren???t based on anything other than pure speculation and conjecture, in that perennials can carry a signal from 10-60 years in their annual rings.