The other important characteristic of scientific knowledge - its openness to change as it rubs up against society - is rather harder to handle. Philosophers and practitioners of science have identified this particular mode of scientific activity as one that occurs where the stakes are high, uncertainties large and decisions urgent, and where values are embedded in the way science is done and spoken.
It has been labelled "post-normal" science.
Climate change seems to fall in this category. Disputes in post-normal science focus as often on the process of science - who gets funded, who evaluates quality, who has the ear of policy - as on the facts of science.
So this book from Singer and Avery can be understood in a different way: as a challenge to the process of climate change science, or to the values they believe to be implicit in the science, rather than as a direct challenge to scientific knowledge.
In this reading, Singer and Avery are using apparently scientific arguments - about 1,500 year cycles, about the loss of species, about sea-level rise - to further their deeper (yet unexpressed) values and beliefs. Too often with climate change, genuine and necessary debates about these wider social values - do we have confidence in technology; do we believe in collective action over private enterprise; do we believe we carry obligations to people invisible to us in geography and time? - masquerade as disputes about scientific truth and error.
We need this perspective of post-normal science if we are going to make sense of books such as Singer and Avery's. Or indeed, if we are to make sense of polar opposites such as James Lovelock's recent contribution The Revenge of Gaia, in which he extends climate science to reach the conclusion that the collapse of civilisation is no more than a couple of generations away.
The danger of a "normal" reading of science is that it assumes science can first find truth, then speak truth to power, and that truth-based policy will then follow. Singer has this view of science, as do some of his more outspoken campaigning critics such as Mark Lynas.
That is why their exchanges often reduce to ones about scientific truth rather than about values, perspectives and political preferences. If the battle of science is won, then the war of values will be won.
If only climate change were such a phenomenon and if only science held such an ascendancy over our personal, social and political life and decisions. In fact, in order to make progress about how we manage climate change
we have to take science off centre stage.