The Bishop of London, Richard Chartes is reported as saying its a sin to fly because it contributes to climate change and is a selfish act. He says "Sin is not just a restricted list of moral mistakes. It is living a life turned in on itself where people ignore the consequences of their actions.” I agree. I don't think the word sin is too strong here. I think the type of flying he is attacking is the cheap short break to Europe type of flying whihc has become common for people to take several times a year. When it comes to the environment the church has a responsbility to be distinctively different, to think through their actions. Theologically the church must rediscover a doctrine of creation that sees humanity as stewards of creation and God's image-bearers within it.