The community as the meta-organism.

With high levels of mutually empowering communication skills, a social environment where we know most of the people we deal with most of the time is ideal habitat for humans.

Matt Ridley - ‘The Origins of Virtue’ - Viking Press.
Human Nature and the Evolution of Cooperation.

Super energy efficient infrastructure in a nurturing environment.

No commuting, unless you want to.

Far less dependant on fossil fuels; ultimately non-dependent.

Links
http://gen.ecovillage.org/

http://www.urbanecology.org.au/index.html