Mr Challen has set out to convey some useful information but the book does not live up to expectations (mine, anyway). It is more of a brain dump about the experience of climate change negotiations. Of course it is interesting (if unsurprising) to have confirmation about how difficult and complex it is to get any kind of consensus in politics - whether that is national politics or international, economics or defence, trade or environment. But those hoping for any evidence that Mr Challen understands the science will look in vain. The book rides on assumptions which are never questioned. It would also benefit from a thorough edit, since there is little sign of a larger plan or of any kind of pruning or selection of the material before inclusion.