Note that this isn't normal copyright, the red cross is protected under the Geneva Conventions
https://en.wikipedia.org/wiki/Emblems_of_the_International_R...
A green cross would confuse people.
Where do you get this confidence that there's no confusion with the green cross?
The continents of Europe, Africa, Australia... I've also seen it used in China but I'm not as familiar with Asia because I haven't lived there.
I'm sorry, but if your only example is the US then you're likely to be wrong about a lot of things.
You already acknowledge this elsewhere, and you've also already acknowledged that there's special meaning to the red cross as opposed to merely referring to pharmacies.
I don't know what you're doing excluding Asia or the USA either, while saying
> A green cross would confuse no one.
And then following up with
> I'm sorry, but if your only example is the US then you're likely to be wrong about a lot of things.
I didn't exclude Asia, I stated that my experience there is more limited than the continents I listed. The US isn't a reliable authority on any international standards.
If you started up a new video game and the health packs had green crosses instead of red ones, would you be confused?