Humans will never go extinct from anything like that. Even if there are nuclear wars worldwide, some of us will always survive. Other species will not. Through

Humans will never go extinct from anything like that. Even if there are nuclear wars worldwide, some of us will always survive. Other species will not. Through climate change we have brought ill effects to the whole ecosystem of Earth. And irreversible phase already started. That's why doom is used often. You can always say we are not doomed because humans are selfish and don't want to take the blame. Or take as little blame as possible or just plain ignore. Regarding giving up hope and being careless, I can say one thing. Saying doomed does not make people give up. But saying it's not as bad as it looks definitely makes people be careless. Because they now things it's ok and we will survive anyhow, so why should I put effort and suffer. That's what I have seen with climate change deniers.