see the many previous answers, and the other link.
A number of factors, some natural and some man-made, are contributing to the disappearance of bees and other pollinators. Some man made reasons include the use of insecticides and pesticides, air pollution, and possibly antibiotics and certain beekeeping practices. Natural reasons include infection by various viruses, parasites, and fungi.
Colony collapse disorder has eliminated nearly one-third of all honeybee colonies since 2006. There’s no singular cause for this widespread death: scientists believe a collection of pathogens is the likely culprit rather than an individual toxin or disease. Ribosome damage is the common link amongst bees inflicted with CCD. The most logical explanation for such a massive decrease in the bee population is genetic damage due to a multitude of factors – which certainly includes man-made ones, as jfulgenc pointed out.
Vanishing of the Bees, a documentary about colony collapse disorder (CCD) interviews bee keepers, scientists and leaders in food and agriculture about the disturbing rate at which the honeybee species is literally disappearing. As previous answers explain there are many speculative causes but there has yet to be a determined cause.
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