Global database of study programmes? I'm interested in finding all undergraduate/graduate study programmes on the topic of "Sustainable Consumption". 

Is there a global database across all universities and teaching institutions that allows the user to search for study programmes filtered by a certain topic?
I'm not sure that you will find a global database, but for graduate studies and beyond, the Euraxess portal is pan-European and all EU-funded positions must be advertised through it. Unfortunately, "Sustainable Consumption" does not return any hits on the job search, but perhaps other keywords will be more successful.