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