I think the comments coming from a great many people are similar to a conversation I just had with a friend.
He was talking about how the entire of Russia is currently mocking Greta about her environmental campaigns.
I mentioned I face a similar problem talking about a plant based diet - the point being anytime some new information comes to light, even if that info is fact based, and is backed by observation & scientific testing, the real issue is convincing people of the truth, because the truth is often inconvenient to them or a group of people.
On a massive scale, Greta is talking total sense - but that's very inconvenient to the Russians way of life, indeed most of their entire economy depends on it, so they will ignore facts and try their best to ridicule her.
On a personal micro scale - my own life journey I have discovered that indeed the main contributer to the two main western diseases heart attacks and cancer is meat products or animal products, being on an equal footing with an inactive life style. Sure you can run marathons like no bodies business, but it will not offset a high animal product diet - its not just the meat your eating in short.
However my main point of this post is (relating to the topic) - how do you convince people of factual information ?
The main issue of our times is this very problem - perhaps it deserves its own thread - people find it so very very easy to dismiss others views swiftly, because they don't agree with it - yet facts stand, regardless of opinion.
Its very easy in some ways to find the truth, you can have scientific studies, but you need to look at who funds them, pro meat clients or pro vegan clients........after 1000s of peer reviewed papers, somewhere somehow the truth begins to slowly emerge - however truth is, often highly annoying to a great many people.
How do we as a people address this problem? Meat eating, Greta, brexit, all of these issues to solve, all revolve around - what really is the truth ? How do we protect fact from political/human meddling ?