The cutting edge rTrees project has been announced---a virtuous donation dapp powered by DeFi that plants real trees using only the interest earned on the DAI in your crypto wallet.
rDai allows users to not only earn interest on their DAI, but to redirect that interest to different ETH addresses such as the one one supporting rTrees donations.
It works by activating otherwise idle money — the USD-pegged stablecoin DAI — to generate interest from liquid lending pools (currently about 5.9%), and then donating the accrued interest to Trees for the Future, who use it to plant real trees. (Our friends at The Giving Block help with that final crypto -> charity step.)