Sequence of tenses in conditional sentences

Which one would be right?

1. If we could stop climate change, it wouldn't necessarily mean that all species would be saved from extinction.
2. If we could stop climate change, it wouldn't necessarily mean that all species are saved from extinction.
3. If we could stop climate change, it wouldn't necessarily mean that all species were saved from extinction.

Judging from what I know about sequence of tenses in non-conditional sentences, I believe right answer is 1.
While I fully understand that, by logic, there should be no difference in rules on sequence of tenses between conditional and non-conditional sentences, I probably just haven't used them together so much that I could get a confidence.

Also, if you could provide me with some helpful tips on this (and/or links to places on the web, where such grammar is described), that would be greatly appreciated.

Thanks a lot.