Chicago NWS demonstrates why climate math is hard in their May 10th summary, which I reproduce in entirety below from http://www.crh.noaa.gov/product.php?site=LOT&issuedby=ORD&product=CLI&format=CI&version=7&glossary=0...
Scoring free stuff at nice hotels is a rare occurence (hello, $10 bag of mini-bar peanuts!), so when a classy establishment like the Crowne Plaza pays guests to embrace green energy, we get a little bit excited...