Letters to the Editor
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Imperfection
As you say, you're not perfect. You do a lot, as much as you can, but you're not doing a lot of things you know you could be doing. Maybe Himself is just one of those things. He's the beef you've compromised to eat. He's the 30mpg car that isn't a bicycle or a hybrid or a public transportation pass.
I think you should just accept that.
You might also start selling your lifestyle on selfish grounds. I have a relative who "seems" super green to everyone who knows her, but she's the most right-wing selfish b*tch you'll ever meet. She likes organic and local because it tastes better and is more expensive, etc. You can perhaps cultivate Himself's palate so that even if he doesn't agree with your views, he embraces your lifestyle -- for his own selfish reasons.
That way your philosophical differences can stay below the surface while you both agree that your picked-that-day organic veggies are the best thing ever.