"Climate chaos" has caused widespread losses of bumblebees across continents, according to scientists.
Dr Tim Newbold of University College London (UCL) said there had been some previous research showing that bumblebee distributions are moving northwards in Europe and North America, "as you'd expect with climate change".
He added: "But this was the first time that we have been able to really tie local extinctions and colonisations of bumble bees to climate change, showing a really clear fingerprint of climate change in the declines that we've seen."
Bumblebee declines are already more severe than previously thought, said lead researcher Peter Soroye of the University of Ottawa in Canada. Bumblebees are among the most important plant pollinators.
