How far would you go to save the planet?

A year or so ago Monty was trying to come to terms with his use of plastic and he came to in my view the most sensible conclusion that he would use and preserve all of his plastic items until the end of their serviceable life. Peat is the hot topic now with organisations calling for the end to peat digging but what about the heating of greenhouses, I've just been reading a question about greenhouse heaters and it occurred to me that a greenhouse must be one of the most wasteful structure that you could heat with very little if any insulation. On last weeks GQT Fife Botanic Gardens have now stopped heating all of their greenhouses due to the unsustainability of doing so and in the process shrunk their carbon footprint by something like 95%. How much benefit would there be to slowing global warming by not heating the common-or-garden greenhouse?
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I can't imagine heating a greenhouse! Any tender plants I have are put in the zip up affair, or brought into our frost free but cold porch. They have survived in previous years. Just as we look at food miles (I haven't eaten a banana or a pineapple for years) we ought also be looking at prima donna plants and deciding whether they are worth the cost of keeping them cossetted.
Have gone peat free and reuse plastic pots though guiltily throw some away. If only plants came in properly compostable pots.
As for outdoor heaters - crazy!