twenty-first century. In developing what he calls a 'New Moral Realism', Gabriel breathes new life into the idea that humanity's task on our planet is to enable moral progress through co-operation. It is only by achieving moral progress in a way that incorporates universal values - and thus embraces all of humanity - that we can avoid the abyss into which we will otherwise slide. Written with verve, wit and imagination, Gabriel's call for a new enlightenment is a welcome antidote to the value relativism and nihilism of our times and it lays out a moral framework within which we can work together, as surely we must, to deal with the great challenges we now face.