Extinction is bad (in my opinion). Especially if we were to go extinct that would be the end, but humans or human like species can be re-born. Just like how there are animals similar to dinosaurs. There are different eras to earth, which gives us an idea of things that happened and lived then. The way extinction happens is bad, and for whatever that species had done for our earth; Like if bees went extinct that would be bad, since there would be nothing to pollinate our things. (I can bring more up if needed.)