This is a huge problem.
Food crops like corn, wheat and rice are wind-pollinated or self-pollinating but almost all fruits and vegetables are pollinated by bees. Bees are conected with 30% of our food. No bees - no food for 6 billion people.

I whached this TED talk last month :
Why bees are disappearing
here:
https://www.ted.com/talks/marla_spivak_why_bees_are_disappearing
or here:

it is only 15 min but very interesting and important mesage...