Hmmmmm.....

Ruth Tighe makes a suggestion:

If tourists are on island during Beautify CNMI! cleanups, they could be invited along, to pick up trash, to paint over graffiti, to plant trees. Tourists could even be enlisted to help survey marine populations as they dive and snorkel - so they could feel part of the battle against global warming - and the campaign to restore CNMI waters to their former pristine condition.

I think it is worth looking into.