How was Jesus in touch with the natural world?

Jesus Christ was brought up in a place that was dominated by the agricultural year. Many of his parables have to do with agriculture, and some of his healing miracles are very earthy – I think of him picking up some earth and spitting on it, and then putting it on the eyes of the blind man. So here we have somebody who is profoundly close to the earth. That's not very surprising, because to be humble is to be very close to the humus – the Latin word for earth.

What do you think was green about what Jesus said and did?

He lived in the context of the Jewish scriptures, which not only have covenants between God and the chosen people, but also have a cosmic covenant. We are here, says the Book of Genesis, "to dress and to keep" the creation. We're not to tyrannise it – we're here as stewards. We are to balance development and preservation, and this is summed up in the covenant that was made with Noah, the covenant symbolised by the rainbow. Jesus Christ comes as the one who opens the door to the new creation and says, "Behold I make all things new". He comes to refresh, restore and redeem not only human individuals, but also the whole creation. We see that particularly in the vision at the end of the Book of Revelation, where there is "a new heaven and a new earth".

How concerned are you about the state of Planet Earth
(on a scale of 1-10 where 1 = not worried at all! and 10 = extremely concerned)?

I try to learn from really competent scientists. In most areas of life, I find that lay people are more alarmed than the professionals. But this is one area where I find the professionals are more alarmed than lay people. Their alarm is based on actual observations – the acidification of the seas, the destruction of the base of the food chain in the oceans, the rate of melting of the Antarctic ice sheets. While I think we can't contemplate the kind of scenario James Lovelock holds out to us – because if we believed what he is saying, we'd be totally immobilised – I think there is nevertheless very considerable cause for alarm.

What practical things do you do to help the environment?

Increasingly I change the way I travel. In every respect I'm trying to change the way I conserve energy. I think restraint is not only an economic question, it's also a question about one's cravings, fundamentally. So I think that going slower, celebrating enough-ness, doing all those things that people are very sorry they haven't done when they are about to die – these are very practical ways of responding to the real emergency we're in.

If you were a plant, what plant would you be? And why?