The building of the Faculty for Environment and Natural Resources, Tennenbacher Str. 4, 79106 Freiburg im Breisgau (see http://goo.gl/maps/JFISf or coordinates 48.003498,7.85385) is in the north of the city center, ca. 20 min walk from the center or the main train station. Below a map with the the route I would recommend to take from the main train station. It’s maybe slightly longer than its alternative along the main road, but much nicer
The closest tram stop to the faculty is tram 2, “Tennenbacher Straße”, marked by a red circle on the aerial photo below. For public transport connections, I recommend http://www.bahn.de/i/view/DEU/en/index.shtml, using your current location (any location, doesn’t have to be a stop) as origin and “Tennenbacher Straße, Freiburg im Breisgau” as destination.
To get to my office, enter the building Tennenbacher Str. 4 at one of the two main entrances marked by the red circles. My office is on the 3rd. floor, at about the location of the red square, room 03.053, phone: ++49 761 203-3747.