Hi Ahmad
I agree with Delft and Aalto being excellent in these fields, also look at the programs in Italy since they have a long history with sustainability as well. At Aalto, from what I have seen you will be able to specialize more into sustainability, while Delft has a more integral approach to product development. In Scandinavia you will be insisted to put sustainability more prominently on the agenda but of course that is rooted in their entire culture. So it is just what you prefer.