For me it is very important that coin would have a practical use.
It is necessary to check what have already been done, how usefull will be project and its token in future.
Now appear some cryptocurrency projects using blockchain to keep the environment clean.
Here some of them
https://moss.earth/blogI think it is very important to keep the earth from pollution.
I checked MOSS project according this link. It has done a lot for the cleaning the planet against pollution. It is good that blockchain can be used to solve the environment problems.