The construction sector could contribute hugely to a sustainable environment. Therefore the UT is doing research into the question how to build in a more sustainable way. The use of material, energy and space are key factors here, but also improvement of the building process as such is a major issue. Naturally, we are constantly trying to make our own green campus even more sustainable. In the O&O centre, for example, energy measures have been put in place and rainwater is purified by a helophyte filter, so that it can be discharged directly into the surface water.