RE: "We have to start thinking about the planet we are going to leave behind for Keith Richards"

People very much latch onto all-or-nothing in so many areas of life, when that just isn't usually how it goes.
Like pre-allergy diagnoses, I was either lacto-ovo vegetarian or vegan for over a decade. I say it like that because I didn't declare one day to be vegan, I just gradually became more and more vegan as I tried new things. I am of course not now because my diet is so limited from the allergies (and still shrinking, sigh), but despite the diet change I've still got a smaller carbon footprint than most Americans by a lot when I do those calculators and compare. We all have different circumstances and do what we can.
It's like with new years resolutions, people have one slip and feel defeated, when that mindset is the problem. Perfection isn't the goal, just doing what you can is. :) Being 75% vegan or whatever is still great!
!BEER