The difference is Nuclear Armageddon only happens IF someone presses a button, if nobody does anything nothing happens, but something like climate change requires action, we need to do something, if we don't act it's womp womp for society. They feel way different.
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Gen X sat in worry of a war that never came, and had adventures because of it.
The millennials grew up with an ever dwindling visible loss of hope, and an ever increasing visible body count.
Boomers(and conservatives in general):
"oh really??? I was traumatized by this thing that I THOUGHT was going to happen, how about that!