Scientists are kinda busy doing science. Take it from me, thats what they do, talking to people and raising awareness isnt really their game. Besides, someone has to be a expert in an area to spread awareness? According to you, you have to be a world renowned oncologist or be diagnosed yourself with breast cancer in order to join in the walks and support a good cause?
Also, as I said before, what do you want him to do, paddle across the Atlantic to meet with European leaders? Having a jet doesnt make him a hypocrite, and in fact, he participates in a carbon offset program, where he plants trees every year that will use all the CO2 his jet produces. He's better than most, if not all of the people with his power and money on an ecological front.
And finally, I dont see how we suddenly got talking about a shitty movie. Beats me where you came from on that.