He commented: "We have parts of our human nature which were ok in early evolutionary times, they probably had an advantage in early evolutionary times but which now are terrible dangers to us. "They include our tendency to focus on the short term, our tendency to be wary and fearful of those who are different from us – it made good sense probably in previous social times but now that instinct is often detrimental. "We have a tendency towards a sweet tooth which probably made a lot of sense when there wasn't much sugar around but now when we have got most of the time lots of sugar available is no longer the best aspect of human nature. "So we have to figure out how do we control these tendencies before we allow others to magnify these impulses with the horrific technology that we have today and produce devastating consequences."