In order to have a sustainable city, the citizens would have to reduce their carbon emission from areas like energy, transportation, and overall lifestyle. To reduce these emissions, energy would have to be clean and come from sources like windmills and solar panels instead of burning fossil fuels. Also, transportation methods would have to change from gas burning vehicles to things like bikes, walking, and electric cars. Furthermore, the citizens of the city would have to make lifestyle choices about what they eat and what they buy to even further decrease their carbon footprints. All in all, if a city like this were ever created, organizations like the Union of Concerned Scientists theorize that the city would attract even more people to live there because of an increase in public health, jobs, and other economic benefits.

I agree. Sustainability is important in a city but tough to achieve. To do so you need to have reduced fossil fuels. You need to use things like solar panels, windmills, etc. Also different ways of transportation or more public transportation. Reducing fossil fuels can be very hard to achieve but it is the only way this planet can be saved from all the waste we put into it.