I did not realize this was an ongoing problem or that is was still such a mystery. The article puts forth the premise that increasing pesticide use is to blame for hive collapse, but they are still not certain.
Research conducted in 23 US states and Canada and published in the Public Library of Science journal found 121 different pesticides in 887 samples of bees, wax, pollen and other elements of hives, lending credence to the notion of pesticides as a key problem.
One thing is certain, we need bees to grow food. If our agricultural methods are destroying the worlds bee population than our agricultural methods are not sustainable.
Read the whole article.