Vegetarians to save the world?

In today's Times, Lord Stern entreats us all to become vegetarians to combat climate change. That's certainly not going to win him many supporters. After all, humans are omnivores and meat eating is a trait we share with a significant proportion of the creatures on our planet. I accept his point that rearing livestock for meat is hugely resource-inefficient - the same resources would go many times further if directly consumed - although I suspect he may be overstating the contribution of methane from cattle to global warming. But that's really not the point.

As with so many sustainability issues, moderation is the key. I'm sure that the right to eat meat would be fiercely defended if it came under threat, but many would accept the idea that consumption should be reduced. The Meat-free Monday campaign takes exactly this approach. Far better to ask people to consider dropping meat one day a week, or at lunchtime, or eating smaller portions - the impact per person might be relatively modest, but the take-up exponentially larger, almost certainly resulting in a better net reduction.

And, let's face it, we're all fed up with politicians interfering in our lives - especially when their own actions are so often at odds with their advice.