I get what you are saying but there is a smug level of superiority, see also Lewis Hamilton, that really grates. Surely Emma Thompson tops the list. She goes into full emotional actor mode, turns on the tears, tells everyone else to change but she will carry on flying because films and award ceremonies are worth killing the planet for, okay I may have added the last part of the sentence.The society we live in means it is virtually impossible to not use fossil fuels and to do things that are bad for the environment. We really need to move away from the concept that unless you live in a yurt in a commune recycling your own p**s to drink you can't have an opinion on the environment or that you can't point out that we are in dangerous environmental times. As there are some really powerful people out there who, for mostly financial reasons connected to their personal wealth, want you not to believe that. For example my young daughter has been greatly inspired by Greta and the ilk to make some changes as to be honest she is not a cynical old fart like the rest of us, always looking for a reason not to change their comfortable lifestyle.
Yes there is some hypocrisy there and they know it and have admitted it. But for the sake of the younger generation we should occasionally listen to the message and drop the snark.
My point, and others, is that I don't expect everyone to go back 200yrs but those giving the message have to have a degree of credibility otherwise people will switch off and the very good message gets lost.