In our world today, we are overwhelmed with so many everyday conveniences. It can become easy to forget how our choices can gravely affect our environment. With working towards a sustainable city, we have to think about the survival of our resources and the wellbeing of our planet. “In 2012, CO₂ accounted for about 82% of all U.S. greenhouse gas emissions from human activities.” Within our cities so many designs can be implemented to help with the reduction of CO₂ emissions.
Our forms of transportation, particularly automobiles, are a great contributor to our total carbon emissions. In the EPA’s Overview of Greenhouse Gases they stated that “The combustion of fossil fuels such as gasoline and diesel to transport people and goods is the second largest source of CO₂ emissions, accounting for about 32% of total U.S. CO₂ emissions and 27% of total U.S. greenhouse gas emissions in 2012.”
If I were to plan an ideally sustainable city I would start with helping to promote environmentally friendly modes of transportation. Riding a bike is a great way to help reduce a person’s  carbon footprint. However I myself, don’t ever ride my bike to and from places. Living in a busy city, I find it difficult to even attempt to start this kind of a lifestyle. To help biking become a more attractive and simpler form of transportation I would start by increasing the sizes of the bike lanes. This way citizens would find it easier to ride their bikes around a city, individually and with others, and it would help with feeling more secure on the roads. Then I would provide secure parking so that you can lock your bike and be assured that it won’t be stolen or vandalized. Finally I would start affordable city bike rentals, for tourists or for anyone in need of a bike to get around to places.

Sources:
http://www.epa.gov/climatechange/ghgemi … s/co2.html

That is true, because one factor that my carbon footprint was high was because of how much i use car to drive to and from school, along with that going out with friends, shopping and even traveling or visiting. Your right, transportation is a big contributer to our carbon emissions. You can also just walk to and from school if you live close. I feel like most people are lazier and decide to drive to school when the live close, and maybe if you live a little bit farther from school and cant walk because it will take too long to go home than you can bike. We should all really start thinking about our environment and what we can do to make it better. I think your idea of environmentally friendly modes of transportation idea was a very good idea. Or maybe people are just not getting this idea and how they are affecting our environment. If more people knew, they would take action. So maybe its just a problem that not many people know about.