Apparently it has come in conjunction with the uses of new systemic pesticides. These last a long time, but were only tested (by their manufacturer) in large doses in a one time application. The EPA approved their use. After honeybees are exposed, the pesticide gets into their food supply, into their offspring and about six months later, CCD. The bees abandon the hive, leaving only babies and the queen. The ramifications are widespread, for bees, our food supply and probably for humans and human children as well.
This film conveys a lot of important knowledge and I highly recommend seeing it. Two last thoughts: the French EPA (whatever they call it) supposedly runs on the basis that what you don't know can hurt you. Our EPA does not.
And perhaps the most obvious evidence from the film that we have a very screwed up relationship with the environment: the bee keeper that called his bees "equipment." That is an indication of a very serious problem indeed.