"Neonicotinoid pesticides are causing significant damage to a wide range of beneficial species and are a key factor in the decline of bees, say scientists.
Researchers, who have carried out a four-year review of the literature, say the evidence of damage is now "conclusive".
The scientists say the threat to nature is the same as that once posed by the notorious chemical DDT."
Matt McGrath reports for BBC News June 23, 2014.
: BBC News