Any climatic influence on floral phenology or physiology could, potentially, alter bee biology. At present, there is evidence that climate- change-induced asynchrony in pollen and pollinators can occur . In addition, the nutritional composition of floral pollen may also affect bees' health at the global level . For example, goldenrod , a ubiquitous pollen source for bees just prior to winter, has experienced a ~30% drop in protein since the onset of CO2 emissions from the industrial revolution .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report