There are a lot of ways to use NFTs to generate impact, here are a few we are working with our nonprofit partners on:
A) represent land (and show how it evolves over time, eg reforestation/gardens)
B) tokenize art objects
C) proof of life/proof of biodiversity
D) access to real world services: eg hotel discounts

Building: web3 infrastructure for impact @C4CollabEcon

On the left: land NFTs that update when satellites take new pictures and can contain nested dMRV data. Created with GeoBossNFT/BlockLagoon, using Ceramic on XRPL. 
On the right: an 84 yr old master artisan- buy a phygital NFT, get a cool souvenir when you visit the land! Proceeds to locals who live&work onsite.