And a side note, bicycling on the sidewalks here in town is actually ILLEGAL. Bikers have to ride in the main roads with the traffic, who 99% of the time have no regard to their safety or pedestrians.
Fact is, 99 times out of a 100 there is absolutely nothing you can do about the problems facing the world. I really hope you can prove me wrong but the worlds way too complex mate. I admire your idealism as everyones thought that at some point, then over time you realize the world isn't black and white but grey everywhere…