Bacteria cannot be seen with the naked eye so for almost anyone, and especially at the time there is a huge element of 'believing' for bacteria as well. So toda

Bacteria cannot be seen with the naked eye so for almost anyone, and especially at the time there is a huge element of 'believing' for bacteria as well. So today we can buy our own microscopes, and maybe you have but certainly back at the time when policies on health were changed in response to science on bacteria, it wasn't because every single person who implemented them had a microscope or the appropriate training - they had to trust some other people who had done the background work - much as today. The biggest problem I see with the same trust applied to the work done on climate change is the human lifetime. Antibiotics, for example can have a positive effect in a timescale appreciated by everyone but changes to policy that can help climate change take place over many years and are much harder to visualize or associate cause and effect.