http://www.wired.com/wiredscience/2010/12/white-nose-syndrome/5/
Or so this article seems to imply. Long story short, there is a sychrophilic (cold-loving) fungus that infects bats while they hibernate. The fungus is a mutant that's developed enzymes for digesting their flesh, much like the demon worms in Miyazaki's Princess Mononoke (a comparison actually used in the above article). In the Appalachians, the fungus has gotten into hibernation caves and killed about 90% of the bat population in each respective cave.
This has the potential to be a significant ecological disaster.
I'd like you to consider a few questions of interest. What concerns you more: Seeing a species die in and of itself? Or are you more concerned with how it could directly impact your life? Or do you not care?