Neonicotinoid Pesticides Are Killing The Bees

In Northern California, butterflies have been mysteriously disappearing for decades.

According to new research published in Biology Letters, there's even more proof that the butterflies aren't just disappearing because land-use and the climate changing - they're disappearing because humans are killing them with neonicotinoid pesticide use.

The research team - lead by Professor Matthew Forister from the University of Nevada - looked at 40 years of data to separate the different factors that correlate with the declining butterfly population.

The authors found that the butterfly population in Northern California made it a biodiversity hotspot - but that populations have been in decline since the late 1990s without any correlation to recent temperature or land-use changes.

But the decline lines up neatly with the increase use of neonicotinoids - which were first used in 1995 in Northern California.

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