@Solveig0 It's a nice idea, but I don't know how many hosts would be able to check most of those boxes.
1) renewable energy. Solar is too expensive for us to install at this date in our ownership cycle we would never be able to recoup the costs.
2) we encourage guests to recycle and have it in our house rules, but this isn't enforceable. Many, many guests don't recycle or they do not recycle everything that should be recycled.
3) we could use organic soap and cleaners, we use some now but not exclusively, and raise prices to cover the extra cost.
4) having guests shop for local produce is not realistic, there are a few farmers markets around, but most of our guests come to see New York and are not going to be interested in spending extra time to go to a farmers market. most hosts are not going to have enough extra space to have a full garden, and again, like recycling it seems like it is something that cannot be enforced. if guests want to go to the supermarket or buy fast food, we cannot stop them.
5) we offer composting, it is written in the house manual that if guests want to compost we will provide a recepticle. ONE set of guests in 6 years has composted their waste. I guess we could make the ability to compost more prominent but since we already do this for recycling with only moderate success I don't see that most people on vacation are going to bother with this.
It's a nice idea but not very realistic from my experience hosting in an urban area.