Editing Peter Singer (section)

====Evolutionary biology and liberal politics====
In ''A Darwinian Left'',<ref>''A Darwinian Left: Politics, Evolution, and Cooperation'', New Haven : Yale University Press, 2000, ISBN 0-300-08323-8.</ref> Singer outlines a plan for the political left to adapt to the lessons of Darwinism and evolutionary biology.  He says that evolutionary psychology suggests that humans naturally tend to be self-interested, and that leftists can't ignore scientific fact simply because it's unpleasant or inconvenient for achieving their political goals.  He further argues that the evidence that selfish tendencies are natural must not be taken as evidence that selfishness is right.  He concludes that game theory (the mathematical study of strategy) and experiments in psychology offer hope that self-interested people will make short-term sacrifices for the good of others, if society provides the right conditions. Essentially Singer claims that although humans possess selfish, competitive tendencies naturally, they have a substantial capacity for cooperation that has also been selected for by evolution. It is the job of the Left, he says, to create those conditions which foster cooperation amongst members of society.