Climate scientist Peter Kalmus works for NASA's Jet Propulsion Lab. But he's not planning to get on a jet anytime soon, because he has given up flying. In fact this keen cyclist, urban beekeeper and chicken farmer has abandoned nearly all activities requiring fossil fuels. His incredible life transformation is brilliantly documented in his book "Being The Change". But why the radical lifestyle shift? Is he trying to save the world? Ah, well it's not that simple...