Haha, good one Geoff, well you made me laugh. Anyway we removed the use of Nitrous Oxide on the Maquet Flow i anaesthetic machines we have in Theatres last year. There appears to be quite a bit of concern regarding the environmental effect of Nitrous oxide ......some info below

https://www.gov.scot/publications/a...y-sustainability-report-2021-22/pages/4/