Some but not all the ideas they came up with were as follows;
wind turbines
solar panels
large windows to reduce power use
rooftop gardens with chickens
compost bins on all buildings
services built into the buildings you live in to reduce travel
no cars allowed in the city centre
solar powered cars
electric car charging stations
I cannot rave enough about how much the students love construction and having the freedom to create what they choose under the umbrella of a main topic. They loved it!! They worked every week for an entire term and did not get tired of the project but the complete opposite. They took so much pride in finishing their projects and it was a real joy to see the final product when all their works were put together to make and environmentally aware city of the future.