I think we all need to make changes.
But the OP telling people ot to fly because she has chosen not to for 5 years seems a bit off.
Firstly, I am sure everyone who flys driving to Europe, for example, wouldnt actually help the environment. Unless she is suggesting no one ever leaves their own country. I think that would be a real shame and the world did fate very well when we all just kept ourselves to ourselves.
Also the OP, chose to stop flying 5 years ago. But in the time had 2 young kids and is contemplating a 3rd. If she was so aware of the environment 5 years ago. Why has she had 2 kids in that time? Why would she even be considering a third?
Why would she have moved or uproot her life so they didnt need 2 cars?
I moved offices recently. One of the reasons being it's closer to me house and I can bike in. Reducing the need for my car. I cant get rid of it completely as the school my son was given is 2 buses, which would take an hour each way and I wouldnt be able to work if I used buses.
Myself and dp also try and eat sustainably. We have reduced meat consumption to 1/2 per week. Grow most of our own veg and any meat we eat is bought from local sources. We dont use the car at weekends unless theres no way around it. We live near his family and my friends so use the bikes at weekends. Walk into town if we want to go etc.
I also havent flown for years. But out of choice. I am hoping to fly in the next year.
People are talking about 'needing' to fly and 'needing'to visit family. But I can bet those people do not only live by only having stuff they 'need'.
If everyone reduced the things we do it would help. But that would also mean not having 2 kids, not having 2 cars, not contemplating a 3rd child etc.
I have one child. No one would I start a thread begging people to only have 1 child. And telling people who had 2 or more selfish and that they will be the death of the planet despite the children being the biggest impactor.
With the ops attitude we would be heading into a society where, the number of children we have is heavily controlled. And I bet many of the people moaning about people flying, wouldnt be happy about that either.