When we think of harmful emissions, we think it's fair to say most of us picture clogged motorways not busy hospitals.
But environmental damage from anaesthetic gases is a thing; one hospital with 15 operating theatres will emit the equivalent to driving two million kilometres in a petrol-powered car.
It's a problem that saw an Auckland University professor leap into action, inventing a device that captures almost all of the gases released during surgery.
That device has just had a successful trial - for more about this Professor Saeid Baroutian chats to Jesse.
Photo: RNZ / Nate McKinnon