The move to live ethically has been influenced by realising that God wants us to love the planet just as he wants us to love others (its all interrelated). See Genesis 2.15 Ecotheology, Living Generously, Christian Ecology.
For a while we have recycled, composted, bought fairtrade, used washable nappies and bought most things second hand (this one is more to do with being cheap-skates than living ethically but now our charity shop shopping and second hand purchasing seems even more worthwhile). We hope to make more small steps toward ethical living in the future - we will try to blog about these as we do, so watch this space...