I don't think that elecromagntic waves (I think that's what you point to) are harming our environment to a noticeable degree; but the use people make of electronic devices sure has an influence on our environment. If for the good or the bad, maybe the next generation can tell. Take navigation systems, for instance: Nowadays, you use them to find the fastest route from A to B via C. In the future, maybe these data can be used for "traffic shaping", i.e. to direct travel off from the main routes to roads less traveld (which I would find desirable), or for planning and building even more and bigger roads from A to B where the main traffic runs (which I would find undesirable).
So in my opinion, electronics give us a good chance to make something reasonable of it and even help protect the environment. The technology is at hand; the question is: How will we use it?