Global warming isn't the only  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    to humans. The falling  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    of insects is also  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   . Half of all insects  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    have been dying since the 1970s. Over 40 per cent of insect  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    could die in our  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   . The number of insects is decreasing by 2.5 per cent a  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   . It is an "insect apocalypse". Many  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    of butterflies, bees and other bugs are now  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   . Scientists say this could cause, "a  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    collapse of Earth's ecosystems". Pesticides used on  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    and gardens are killing  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   . Fewer insects mean we have  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    food. Three quarters of our crops depend on insects. We can't feed 7.5  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    people without insects. A big  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    is the decline of honeybees. In the USA, the  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    of honeybee groups dropped from six million in 1947 to 2.5 million in 2014. A  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    warned that: "We can't wait  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    25 years before we do  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year    because it will be too  another anything billion catastrophic danger dangerous extinct farms insects late less lifetime number numbers professor species worldwide worry year   ."