I work for (what I am told is) one of the leading Swiss environmental consultancy companies,
www.carbotech.ch. I am involved with the LCA (life cycle analysis) side of things, but there is also a technical service.
Offices in Zurich and Basel. Great bunch of people to work with, with a particularly refreshing committment to their principles even when in conflict with the furtherance of their business. Quite a shock after my last sector (lawyer in the financing and construction industry).