Correct. When we speak of moral we assume that there are choices, and then you pick one. If there is no choice, there is no moral. The description of what happened to animals and wildlife (especially from the 20th century) as a deterministic force of nature, a.k.a gas release, can lead us to think that this is how evolution works, no choice, no moral. You can say "I support ivory jewels" or "I object ivory jewels". Both opinions are very different than saying "ivory jewels is a natural force of nature like gas release". The level of nature depletion by humans is, to some extent, a choice.