Our guest this week is Peter Kalmus, who is, among many things, a physicist, a climate scientist, a gardener, a beekeeper, a cyclist and the father of two boys-- who has come to the podcast today to talk about Be-Cycling, his response to global warming. Through a series of lifestyle changes he has reduced his personal co2 emissions from 20 tonnes a year--which is about the US national average--to two tonnes. And he says he’s had a great time doing it.