You learn to rely on a few basic movements and use your voice to the greatest extent possible to convey your emotions. So there was a technical challenge there and a responsibility to create a character from behind the mask.
And then of course, obviously as far as issues such as global warming, something has to be done on the corporate side, there has to be some mandate or some legislation.
Frankly I've never really subscribed to these adjectives tagging me as an 'icon', 'superstar', etc. I've always thought of myself as an actor doing his job to the best of his ability.