http://www.newscientist.com/article/dn13505-named-25-environmental-threats-of-the-future.html


I have to site where i get this from... Now then it says how nanomaterials, manmade viruses, and biomimetic robots are big threats. Also are acidifacation of our oceans, and even the increasing extreme weather disasters. Aside from the last two i listed (because they are rather self explanatory) and the man made viruses... who knows about they other two?

Biomimetric robots (could possibly become invasive /// http://www.wisegeek.com/what-are-biomimetic-robots.htm)

and Nanomaterials (http://en.wikipedia.org/wiki/Nanomaterials)