A North American study suggests that bumble-bees are having their ranges restricted by the impact of global warming (http://www.nytimes.com/2015/07/10/science/bumblebees-global-warming-shrinking-habitats.html?_r=0). The suggestion is that these bees (that do not live in large colonies) are finding it difficult to move north as their flowers relocate in response to climate change. The plants would also suffer from the loss of important pollinators. The similar phenomenon would presumably apply to species being forced up mountainsides as eventually there is no where else to go.
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