I don’t know about other countries, but in New Zealand there’s already recycling of leftover bits of drywall (we call it ‘gib board’ after a brand name). All the big building companies will accept leftover bits of gib board, but small bits can be thrown directly in your garden beds to help break up clay.

The gypsum used in New Zealand is mined locally.

I was just wondering where our gypsum came from, I always assumed it was mined. Thank you for the information.