Sustainable Urban Living
Sustainable living means living in a way that lets people meet their needs now, without reducing the ability of people to meet their needs in the future. Basically, it means living in a way that doesn't irreversibly damage the environment or use up resources faster than they can be replaced. Big cities need so many resources that it's unlikely they'll ever be truly sustainable, but things can be done to make a city (and the way people live there) more sustainable.