*DdraigGoch · Today 17:48
As for the two biggest things you can do personally- not flying and giving up meat and dairy
The biggest thing that you can do is sell your car. An omnivorous diet represents a mere fraction of the emissions of even an electric car.*
Not true- and unachievable for many.
And I'm going to have a rant now. I am sick of the greenwashing perpetuated by the agricultural industry. For sure other sectors do it, but it seems to be relatively more challenged. Why so? Because, to many, cute and cuddly cows represent "nature", so how can that be the problem? Because people feel personally attacked if you suggest cutting down on meat is a good thing to do? Possibly a bit of both of these, and other factors too. But, the science could not be clearer:
https://www.theguardian.com/environment/2018/may/31/avoiding-meat-and-dairy-is-single-biggest-way-to-reduce-your-impact-on-earth
*"The study, published in the journal Science, created a huge dataset based on almost 40,000 farms in 119 countries and covering 40 food products that represent 90% of all that is eaten. It assessed the full impact of these foods, from farm to fork, on land use, climate change emissions, freshwater use and water pollution (eutrophication) and air pollution (acidification).
“A vegan diet is probably the single biggest way to reduce your impact on planet Earth, not just greenhouse gases, but global acidification, eutrophication, land use and water use,” said Joseph Poore, at the University of Oxford, UK, who led the research. “It is far bigger than cutting down on your flights or buying an electric car,” he said, as these only cut greenhouse gas emissions.
Humans just 0.01% of all life but have destroyed 83% of wild mammals – study
Read more
“Agriculture is a sector that spans all the multitude of environmental problems,” he said. “Really it is animal products that are responsible for so much of this. Avoiding consumption of animal products delivers far better environmental benefits than trying to purchase sustainable meat and dairy.”"*
^This is an excerpt, but I would highly recommend reading the whole article.
And I don't speak as a militant vegan- as mentioned upthread I haven't managed to give up eggs and dairy myself. But at least I'm not in bloody denial! And the reason that not flying and seriously reducing meat are so insistently indicated as the best things that the average person can do to combat climate change? Their relative ease and lack of serious impact on day-to-day life. You can enjoy holidays and travelling without flying. You can enjoy delicious food without meat.
Completely giving up driving, for so many, is unachievable without medium term structural change- measures to make cycling safer, or the provision of a decent, functioning public transport system.
So, OP, you asked the biggest barrier to living sustainably? For so many it's denial, greenwashing, misinformation, industry lobbyists, bending of the truth. A tsunami of lies and propaganda, basically.