I was reading somewhere several days ago that some "study" had determine that it would take 5 years of continuous usage of an average CFL for the carbon footprint reduction of CFL over incandescent to make up for the carbon footprint produced in shipping the CFLs from China to the USA (you'll have to recalculate for the effect of shipping to NZ, UK, etc). Unfortunately, I didn't save the link. It might have been a "Chinese import hater" or a "CFL hater". But it could be something to consider.
