Straighterline Introduction to Environmental Science

[Turkish]

...That makes me wonder if it's possible to get through some of these without the exact specific edition of the textbook they list.

Yes, it is possible as long as there haven't been any major re-writes. I've used previous and later editions of texts for other classes that weren't the same year, and I found the majority of the text stays the same. However, for the Straighterline business courses they now offer the ebook included for an additional $10. I found it much easier than trying to source copies myself.

One thing I have noticed though in some of my more recent SL tests is that the wording has been updated. It's not exactly the same as the text, a few words have been changed, so searching the ebook became a bit more challenging if you didn't remember where that section was.