system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it take so long to repopulate endangered species? I'm 31 and and have learned since 2nd grade that certain animals are endagered. 25 years later, they still are. Why does it take so long to breed them or any other endagered animal for that matter? Why can't we just clone them?
gpt
Some are endangered because of things like habitat destruction and overhunting. Simply breeding more isn't sufficient, the causes of their decline have to be addressed, if it is even physically possible to do so. 

Beyond that, breeding can be a difficult prospect, not all animals breed readily or successfully in breeding programs. Cloning, as well, is a technologically difficult process, not to mention that an army of clones does not provide you with much in the way of genetic diversity, you'd quite potentially run into severe inbreeding issues if you rely on it too heavily, even assuming it can be made a viable technique for producing large numbers of young.