I don't think you can call "nanobiology" a "proper" field, it sound very much like re-branded molecular biology or maybe biochemistry.
The word "nano" was a buzzword a few years ago and quite a few universities/departments/groups decided to either start new groups or re-name existing research/programs to include the word "nano". Very few of those were (or are) actually working at the nanoscale (meaning nanoscale "engineering") and much of it was just chemistry.
Lately the word "bio" has appeared everywhere (and if you were doing nano-bio you could almost be sure to get funding) although that word has also been overused.
Looking at FP7 and other documents it seems "environmental" is the way to go, I am sure it is only a mater of time before there are groups for "environmental computer science", "environmental electronics" etc at some universities...
On a more serious note it is perhaps worth pointing out that it CAN be a bit risky to get a degree with a name that includes a buzzword; I actually had the opportunity to choose whether I wanted a PhD in physics or nanoscience (my department could award PhDs in both fields), I chose the former which turned out to be wise. Most people knows what a physicist does but very few have even heard of a "nanoscientist"; especially outside academia. Having a degree in "nanobiology" could certainly give you problems in the future, even if it turns out that you have basically studied biochemistry (when was the last time you saw an job ad where someone was looking for a nanobiologist?).