Colony collapse disorder, which is threatening bee populations across the globe, continues to be an unsolved problem, but a problem that will ring in an era of hunger, if not starvation, if bee populations continue to crash. Around one third of all humanity’s food, and 80 percent of crops are pollinated by bees, so the best case scenario would be economic collapse:
http://readynutrition.com/resources/will-the-extinction-of-bees-really-mean-the-end-of-humanity_04062018/
http://news.cornell.edu/stories/2012/05/insect-pollinators-contribute-29b-us-farm-income
While many internet sites like to take a quick fix approach to this problem, putting the blame on neonicotinoid chemicals alone, a search of the scientific literature reveals that there are probably a whole range of insecticides, and maybe herbicides, and perhaps industrial pollution, which are impacting upon the honey bee:
https://fordham.bepress.com/environ_2015/57/
The honey bee is being seen as highly sensitive to the toxic chemical environments that out-of-control industrial consumerism and global capitalism is producing. Thus, it is the first victim of the cancer of modernity, but it will not be the last.