A large team of ornithologists, zoologists, biologists and ecologists from across Europe and the U.K. has found that the chief cause of declining bird populations in Europe and the U.K. is the use of pesticides and herbicides by farmers. In their study, reported in Proceedings of the National Academy of Sciences, the group examined the effects of pesticides and herbicides on bird populations in a variety of locations.
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Source: Phys.org