I have no worries about a nuclear war, it's never going to happen. I have no worries about global warming to myself, but I do worry about my grandchildren if my kid ever has their own kid. If I lived in Florida I would worry about it a lot more, but I'm pretty safe up in Minnesota for the next 100 or so years. I'm not denying global warming changes, I believe it's a huge problem, but I don't believe it's a problem that's going to kill humans at the scale that a massive nuclear war or a bubonic plague type situation would kill in the next 50-100 years. I do think global warming is gong to be a major issues for future generations that is far more likely worry than nuclear war.