I think non-essentials and some types of food via an emissions tax would be a great thing.

For example, flying is so cheap I would say people "over do it" just because they can. I often think it would be great if there was more cost associated with air fair to factor in the environmental damage each flight causes.

Yeah people will be inconvenienced slightly but what is the alternative? Holiday in locations closer to home? Go by rail? Video conferencing ? They all seem like good options compared to the alternative.