The documented and projected impacts on reindeer are complex and varied. Warming and CO2 increase result in higher plant productivity , changes in plant community composition and higher parasite harassment; unstable ice conditions affect migration; extreme weather conditions during critical winter months, more frequent forest fires and changes in plant community composition reduce pasture quality  . High snow depth and rain-on-snow events impede reindeer access to ground lichen in winter and delay spring green-up during the critical calving period; both cause malnutrition and negative impacts on reindeer health, mortality and reproductive success  . Lower slaughter weights and increased mortality reduce the income of herders  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report