Zero Carbon is the idea that a community can be carbon neutral. There are many proposed solutions to global warming -- carbon offsetting, carbon capture and storage (CCS), contraction & convergence, as well as personal carbon trading.
Zero Carbon is simple and radical -- every community takes care of itself. It doesn't require anyone else to agree -- it's the simplest to do and hardest to fudge, or to turn into a global scam like Cap and Trade.
All we have to do is figure out how to do it, then do it, then help others do it -- and that's the challenge!