A warning that frightens scientists.

Insects are vital for mankind because they are pollen carriers for plants and hunting for animals.

Scientists have already proved that the numbers of bees and butterflies have fallen to just now, but the number of winged insects in Germany's nature conservation areas has surprised many scientists.

Although the exact cause of this sharp decline is unknown, scientists believe that the disappearance of agricultural land and the widespread use of pesticides are the most important reasons. Research results show climate change as one of the potential causes.

Dave Goulso the University of Sussex Life Sciences research professor and co-author of "Insects are observing a decrease in the number awful, but accounts for two-thirds of life on earth," he said and added:

"We make a lot of land in the world unviable for many life forms, and we go to an ecological stink.