Being veggie doesn't ncessarily reduce your carbon footprint. Lots of crops are grown with lots of added fertiliser and transported long distances. I am not talking fancy fruit and veg but coffee, tea, flour, sugar, canned and frozen fruit and vegetables.
Then, of course there are all the services we take for granted; rubbish collection and disposal. Hospitals. How green are they?
Even electric cars are very ungreen. It takes the equivalent of 100,00 miles of car travel energy to make the batteries, they only last eight years and are very difficult to recycle because of the dangerous and damaging heavy earths and rare metals used in making them.