Personally I think that this project has a very important mission and there is no similar projects yet. At least I havent seen them
I met a project that was going to work in the field of ecology, but Greencoin seems to me the most ambitious.
I also saw projects with a similar idea, but they did not become successful. I hope that the Greencoin project will be more successful in the future.
Let's see how the team will invest their money in future advertising, a lot depends on it, even the most advanced project