The hardest problem of all is to appreciate the facts that the poor nations are - quite reasonably - not going to forgo their development, and that they can only afford to develop by consuming fossil fuels.

I'm often quite gloomy about the prospects for the human future. But, although I have no competence to intervene directly in a political movement, I hope that what I write may, in combination with the suggestions of others, cause a shift in perspective that will inspire a world-wide movement to accept the only solution to climate change. And before it's too late.

I don't deny that scientific investigation is capable of delivering important truths about nature, but that doesn't stop questions about whether, as it is practiced, science today lives up to its potential for benefiting humanity.

I suspect that any worthwhile exploration of these deep questions about living requires going beyond abstract discussions to the vivid presentation of possibilities. If readers are to be prompted to serious examination of their lives, anatomy isn't enough. We have to be stimulated to imagine, in some detail, what it would be like to live in particular ways.

I rather stumbled into philosophy. When I began my undergraduate career at Cambridge, I studied mathematics.

Many of the greatest works of philosophy seem to me to be valuable not because of their arguments, but because they offer us perspectives that open up new possibilities. They show us how we might start in different places, and not buy into the assumptions tacitly made on the first pages of the philosophical works that have influenced us.

I'm a fan of Hugh Kenner, Richard Ellman, Lionel Trilling and Frank Kermode. All these people have taught me how to read - but perhaps, above all literary critics, I'm indebted to Wayne Booth (several people have suggested to me that I'm trying to reinvent "ethical criticism").