It's nothing to do with ones own interests, it's to do with believing insufficient or faulty research. Back in the 70s, we were continually being told that the next Ice Age was just around the corner. Now it seems to have disappeared into 'Global Warming' will get us all. Periodically we get things like coffee consumed with bacon creates carcinogens, next coffee is actually good for you. Salt is currently out of favour- what's the betting within a few years salt will be regarded as good again? But when you are presented with scientific 'facts' that present a case, and you see that there are errors in assumptions leading up to those conclusions, then there is a good case to disregard faulty and insufficient research. When Biogenetic companies fund 'independent' research that proves that biogenetic products are harmless, should we necessarily believe them? Without knowing exactly where this theory about contrails comes from, and who funded it, or is it a personal opinion coming from a rabid 'green', then the results are to be treated with great suspicion, especially as this one seems to have made some broad assumptions that are erroneous. It was mentioned back at the beginning it was an old news item?