Learn Turkish: Bu proje ekolojik sürdürülebilirlik açısından çok önemli. - This project is very important in terms of ecological sustainability.

It translates literally to "from the angle of." It breaks down into açı (angle or perspective), the possessive suffix -sı linking it to the previous phrase, the buffer letter -n-, and the ablative case suffix -dan meaning "from."

Why doesn't sürdürülebilirlik take a genitive suffix before açısından?

They form an indefinite noun compound together. In Turkish, when expressing "in terms of a general concept," the concept acts as the first part of the compound and takes no suffix. The second part, açı, takes the possessive -sı to complete the link.

Sürdürülebilirlik is a very long word! How do its suffixes break down to mean "sustainability"?

It is a great example of Turkish suffix stacking. The root is sür- (to last or continue). Then -dür makes it causative (to maintain), -ül makes it passive (to be maintained), -ebil adds ability (can be maintained), -ir makes it an adjective (sustainable), and finally -lik turns it into a noun (sustainability).

Could I use bakımından instead of açısından in this sentence?

Yes, you could say ekolojik sürdürülebilirlik bakımından and it would mean exactly the same thing. Both words are used to express "in terms of" or "regarding" and are usually completely interchangeable.