My dad used to say: "Improve the world? Start with yourself"
My recommendation? Get an electric car. It's even starting to make financial sense now for your daily commutes. Since most NZ households have more than one car anyways, it would be perfect to sub one of them out for an electric commuter. Also, the process of producing electric cars will be offset when the vehicle has driven 50,000km at most, the rest is without emissions. There are plenty of scientific articles available that back this statement.