Scientists themselves readily admit that they do not fully understand the consequences of our many-faceted assault upon the interwoven fabric of atmosphere, water, land and life in all its biological diversity. But things could also turn out to be worse than the current scientific best guess. In military affairs, policy has long been based on the dictum that we should be prepared for the worst case. Why should it be so different when the security is that of the planet and our long-term future?

Fast food may appear to be cheap food and, in the literal sense it often is, but that is because huge social and environmental costs are being excluded from the calculations. Any analysis of the real cost would have to look at such things as the rise in food-borne illnesses, the advent of new pathogens, antibiotic resistance from the overuse of drugs in animal feed, extensive water pollution from intensive agricultural systems and many other factors. These costs are not reflected in the price of fast food.

This was one of those special occasions when I could actually feel the inner appreciation of the beauty of the moment passing like an electric current through the brush in my hand.

The sustainability revolution will, hopefully, be the third major social and economic turning point in human history, following the Neolithic Revolution - moving from hunter-gathering to farming - and the Industrial Revolution

Grandparenthood is a unique moment in anyone's life, as countless kind people have told me in recent months, so I am enormously proud and happy to be a grandfather for the first time and we are eagerly looking forward to seeing the baby in the near future.

We should be treating, I think, the whole issue of climate change and global warming with a far greater degree of priority than I think is happening now.

When people are uncertain about what is right and what is wrong, and anxious about being considered old-fashioned, it seems to be worse than folly that Christians are still arguing about doctrinal matters which can only bring needless distress to a number of people.