At AWS, I once took an entire AZ down of a public-facing production service (with a mis-typed command), but that was nothing compared to when I accidentally deleted an entire region via internal console (too many browser tabs). Thank goodness turned out to be unused / unlaunched, non-production stack. I felt horrible for hours despite zero impact (in both the cases).
So sure, color-code your environments, but if you find someone about to do something to a red environment that they clearly should only be doing to a green environment, just check if they're seeing what you're seeing before you sack them ;)
It seems like a design flaw for actions like that to be so easy. E.g.
> Hey, we detected you want to delete an AWS region. Please have an authorized coworker enter their credentials to second your command.
The service stack for the region (and not an entire region itself) looked like prod, but wasn't. It made me feel like shit anyway.
Another workflow, though cumbersome, is: Search for a username on hn.algolia, select "comments" and "past months" as filters, then press enter.
Ex: https://hn.algolia.com/?dateRange=pastMonth&query=nostrademo...
That's even more surprising to me.