A quick search for bicycle on change.org pulls up two pages of ideas submitted. Below are the relevant links with some redundant submissions edited out.
http://www.change.org/ideas/view/promote_bicycle_transportationhttp://www.change.org/ideas/view/public_bicycles_in_the_cities
http://www.change.org/ideas/view/build_bicycle_infrastructurehttp://www.change.org/ideas/view/parents_and_kids_bike_to_school
http://www.change.org/ideas/view/bicycling_as_a_safe_viable_transportation_option_in_usahttp://www.change.org/ideas/view/stop_killing_americans

Carbon Trace has submitted the 1 Mile Solution to Change.org. 28% of all trips in the USA are within 1 mile of home. The vast majority of these trips are made by car. We should encourage people (who are able) to replace one car trip per week within a mile from home with walking or [...]