Wowwee, you are a great writer. I am in love with the idea that you care so much about our environmnet in saying "Sustainable energy sources are all renewable. Nuclear power is not included because it produces a hazardous waste." -I couldn't agree more, why can't we produce our own energy instead of creating energy that produces a waste of energy anyways? It's a viscious cycle. If sustainabilty is about an object remaining constant then why do we waste our energy with useless nuclear power? Your writing really had me thinking mostly about your three mian points: energy, agriculture, and cities. If we focus on these main points then why should we even waste time and money on waste?

mi gusto :)