Here's your chance not just to be the mayor, but the original city planner as well! Imagine a medium sized city that would be developed with modern, low carbon transportation in mind, and other strategies to reduce the average citizens' carbon footprints.
What would that city look like? Would that make you more likely to want to live there?
Sustainable City >
Bicycles
Are there any rentable bicycles in your cities? I think that bicycles are a great solution for urban areas because they reduce the CO2 emmision, lower the overall costs of gas and foremost give us a form of exercise, if you're not lazy 
. Not to mention it's very fun!
Dear Matej, many cities in the USA have great bicycle rental stations that are very affordable for either visitors (with a one-day or one-week subscription) or for residents (with a year subscription). The first ones I encountered like this were in Paris & Montreal, and have since spread all over Europe and North America.
I think it would be great if you could get an international subscription to these bike rental services, so you can rent a bike wherever you go.