What are the short term affects of decline in bee population?

The main reasons for global bees-decline are industrial agriculture, parasites/pathogens and climate change. The loss of biodiversity, destruction of habitat and lack of forage due to monocultures and bee-killing pesticides are particular threats for honeybees and wild pollinators. It is becoming increasingly evident that some insecticides, at concentrations applied routinely in the current chemical-intensive agriculture system, exert clear, negative effects on the health of pollinators – both individually and at the colony level. The observed, sub-lethal, low-dose effects of insecticides on bees are various and diverse.

Ther are many reasons.. is it a multiple choice?