Perhaps some of you weren't aware, but gas chambers are still used for euthanizing animals in shelters, albeit, more so in America, than Canada.. I ask you to read about this to educate yourself and if you would, help to end their use completely. One article https://animallawcoalition.com/category/gas-chambers/ explains why they're not humane....... https://www.humanesociety.org/resources/bringing-end-inhumane-euthanasia#:~:text=While%20most%20shelters%20around%20the,a%20thing%20of%20the%20past.
A story of a dog who survived the gas chamber https://nationalpost.com/news/world/quentin-the-miracle-dog-who-survived-the-gas-chamber-and-started-a-movement-dies-in-st-louis
an interesting article about the study of euthanasia in shelters within Canada https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3003577/