Scientists say the decline in insect populations will lead to many problems for humans. One of the biggest dangers is that there will be fewer insects to pollinate flowers. This means that farmers will have problems growing food. The lead author of the report, professor Rodolfo Dirzo, said falling numbers of insects could also lead to more disease in humans. He said rats and mice would have less food to eat so they will move to cities and bring diseases with them. Dr Ben Collen from London University said we needed to stop more insects from dying. He added that scientists must understand, "what species are winning and losing in the fight for survival". He said this knowledge would help us to protect the "helpful" insects.