You wrote a great guide. I think the problem is those who care look at your title and assume they already know everything you have to say because they read a lot of these kinds of stories. Those who don't believe in environmentalism aren't going to read that title either.

I found the bit about mushrooms the most interesting. That was genuinely new to me and would be to lots of people. I would have put that in the title. Something like Mushrooms might be the answer to saving the planet. Then a subtitle with a little more info. Lead with the mushroom bit and then add the rest.