evidence: The consensus is so strong because scientists can be sure of the fundamental physical principles underpinning greenhouse gas warming. Indeed, journalist Seth Borenstein recently quoted a scientist equating the strength of the evidence with that linking smoking with lung cancer. [...] However, studies have shown that outside scientific circles, a large proportion of the general public is not aware such overwhelming agreement exists among climate scientists. A recent US poll suggested just one in ten people put the figure at more than 90 per cent. [...] However we choose to talk about consensus, all we’re really doing is exploring how to present scientific facts to different audiences. The facts themselves don’t change. That an overwhelming consensus exists among scientists about human-caused climate change isn’t in doubt. But then again, it never was.