Making cities sustainable would provide a huge help to our Global Crisis. Cities consume 80% of the worlds energy and produce more than 60% of the total Carbon emissions and yet they only occupy a small fraction of the earth's surface. We can make cities sustainable by using wind and solar power, recycle and use electric vehicles.

Sam_nocera, I agree with your take on sustainable cities. I think a great attribution to these futuristic cities, would be vertical farms. Vertical farms are indoor growing facilities that have multiple trays of plants and produce, growing vertically on shelves. This consumes less land, fresher and local produce, cutting down on the transportation of these foods. As these could be grown in the heart of the city. These are regularly misted, opposed to using huge amount of water sprinklers. These farms would be extremely beneficial to the environment.

Cities should be better mixed-in/organized. Communities used to be a lot smaller, but with farms and things you can have a lot of people in one place, however, this causes a need for a lot of energy in a small amount of space, which creates a need to burn fossil fuels. If everything was more mixed together, instead of having lots of different sections for different things, biking would be more convenient and people would probably walk and bike a lot more and cars would be less necessary. Cities should also use a mix of renewable energy. Solar panels are good but take up a lot of space, hydroelectricity is also good but has an impact on water creatures, wind also takes up a lot of space. Using them together would create more renewable energy.