They don't have expert knowledge of climate science and that makes it easier to speak in absolutes even though the science on the weedkiller/cancer issue is actually settled. One of the authors grew up in a culture that didn't believe in evolution or climate change, so they are sympathetic to the idea that there are often values issues involved. \"), models of today will never need to be reconsidered in the future, and they trust climate scientists absolutely. Standing outside a Whole Foods with a white paper on the safety of all American food won't do any good - they will know right away you are a scientist and think Monsanto bought you off. (6) When I give talks on science communication, I tell scientists to answer questions like they are sitting at a bar.