Overuse of pesticides and herbicodes has dimished low level plant, fungal and bacterial life, not only is it bad for all insects and the biosphere in general. But it has been proven (see Paul Stamets and others work) that bees gain a host of immunities and benefits from this low level plant, fungal and bacterial life.
Polution, deforrestation and climate change obviously have a part to play too.
Like I said, you can fuck right off with ya victimhood.