Reading the InfoWorld Green 15 awards that we unveiled yesterday brought Bob Lewis back to the 1980s. Indeed, that was before the words Green and IT went together as they do today. “My old friend Fitz should be on the list, but won’t because his innovation took place too many years ago,” Lewis explains in Go green the cheap and easy way. Fitz, you see, tapped the cold Minnesota winter to cool his datacenter by asking not the CIO, but the company’s construction department, to install a vent. “It’s nearly free, pretty much foolproof, saves electricity, and will make you look smart besides.”What ad hoc green IT approaches have you found success with?Related: InfoWorld Green 15 awards. Technology Industry