One issue with CFLs that most people seem to be leaving out is they contain mercury, and are a hazardous material because of it. It's not a particularly green product.
In general incandescent bulbs are the "greenest", since they use lots of power, and therefore require, hopefully, lots of coal or other carbon emitting substance to be used. This Carbon Dioxide is, naturally, loved by plants which grow faster and produce more food, and extend the growing season for them a bit. So, plants like carbon, not mercury, and incandescent bulbs give us the former, CFLs the latter.
I don't know why jackasses call losing little power "green". The plants want more carbon dioxide, not less. They need another term for it.