It is estimated that only about 10% of the wild honey bee population is left from its peak population 50 years ago, and managed colonies have declined about 2/3. Africanized bees have been displacing the shrinking honey bee population in the southwest, however. Culprits for this decline include pollution, invasive bee species, disease, loss of habitat, and pesticide misuse.
To add to this answer, according to Discovery News and specifically researchers at the University of Illinois at Urbana-Champaign, some species of bumble bees have declined as much as 96%! Others, anywhere from 23-87%. This is bad news for U.S. agriculture. Bees pollinate many vegetable crops in North America.
As the previous two posters said, not much. I’ve read that cell phones may be a partial cause of the bee decline. I’ll summarize the article below that the noises and signals that an active cell phone gives off disturbs bees, and they give off signals of a possibly distressed bee colony.
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