Bumblebee babies are dying in their nests because global temperatures are getting too warm, study finds

Scientists have been warning for years that bumblebee populations are declining, posing a risk to the vital role that pollinators have in helping maintain food and plants across the world. New research has found a "major factor" in why. 

The answer? It's getting way too hot. 

Like humans, bumblebees' bodies thrive best within certain temperature thresholds. Based on 180 years worth of literature, University of Guelph environmental science professor Peter Kevan and his team found that bumblebees are most likely to survive up to 36 degrees Celsius, or 96.8 degrees Fahrenheit. Their optimal temperature range for development is between 30 and 32 Celsius, or between 86 and 89.6 degrees Fahrenheit, depending on the species.