lostonearth35 wrote:
And just last night there was a program on the local news channel about how we're running out of water because of global warming and that it would lead to all kinds of horrible things. Huh? I thought we were all going to drown from too much water because the polar ice caps are going to melt.

Melting ice caps go into the sea and become saline. This water is a) undrinkable and b) raises sea level by some extent. No-one (sane) suggests that we will all drown. However, many major cities (NY or London, say) and large areas of some countries (say Bangladesh) are at very low elevation above sea level and therefore vulnerable to rising sea levels, that's all.
The effect of global warming on supplies of fresh water is complicated, but largely irrelevant. The main problem is that the amount of available fresh water is limited (unlike the amount of food production, which has proved resolutely non-Malthusian), while human population has been relentlessly increasing for a long time, meaning that the demand for water for agriculture, industry and plain drinking is high and rising. Global warming doesn't help, but it isn't the root of the problem. It won't wipe out humanity though, just constrain it (and presumably with sufficient energy one could desalinate the crap out of a load of seawater, something which is already done in some places).
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another reminder about the comet or asteroid that's going to hit the earth soon.
No major impacts with Earth are currently foreseen by anyone (sane). There are a few biggish objects (like Apophis) which will come close -
in astronomical terms, which in this case is usually "within the orbit of the moon", in other words tens or hundreds of thousands of miles away. It's difficult to predict the precise orbit of an asteroid some distance into the future, though, so they are something that we need to keep a scientific eye on.
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But what I want to know is if the world really is going to end soon and it's going to be worse than any nightmare I've ever had- and I once had a dream as a teen that the world blow up- why do the people who say so choose to continue living?
For religious types, that's fairly easy. Apocalypses are fascinating to contemplate, you get to promise your followers that they don't have long to wait, and that all those smelly nonbelievers will meet some horrid fate while you'll be rollicking around in Heaven; you can also justify any sociopathic and insane behaviour you feel like because "none of it will matter in the long run". You get bonus points if you convince your followers to give you all their money.
For non-religious types, I dunno. People in general will put up with a lot of hardship in the hope that things may someday improve. And there's the fame and the possibility of saying "You thought I was mad, fools!" mad scientist style.
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Why not end your life in a faster and less painful fashion?
"You must lower me into the steel" and "for in that sleep of death, what dreams may come?" Killing yourself is hard thanks to our hard-wired survival instinct, and also some clever theocrats hit on the idea a long time ago that they could keep their followers alive to serve them by promising eternal damnation to suicides. And leaving that aside, one could imagine anyway that death might not provide an escape, that there might be an unpleasant afterlife waiting for everyone. Killing yourself imposes a burden on your family and friends, too, another reason not to.
Personally, I'm not too worried about the end of the world. I guess the biggest threat is the possibility of a runaway Greenhouse Effect, which would pretty much stuff life on Earth. Second would be a full-scale global war with mass use of salted nukes, which would set life on Earth back a long way. As noted we don't know of any rocks likely to impact (and they'd have to be considerably bigger than Apophis to do real damage.) We're unlikely to be hit by radiation from a random supernova as we're in the wrong part of the galaxy for it. A runaway virus might take out civilisation, but it wouldn't wipe out humanity. Hawking radiation means we can probably rule the LHC out. Fah. I'm more worried about religious muppetry continuing to ensure the unhappiness of most of humanity than of the End of Days.
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