Arctic temperatures are rising faster than the world average, due to greenhouse gases building up in the atmosphere, and in the winter, there is less snow and more rain, which freezes into sheets of ice, making it more difficult for reindeer to get to their food. As temps go up, food sources go down!
Link to the full article: http://theweek.com/speedreads/666759/scientists-say-climate-change-causing-reindeer-arctic-shrink
