A sharp decrease in the diversity and abundance of macroscopic life.

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1answer
583 views

Would humans starve if spiders disappeared?

In this Washington Post article, Norman Platnick of the American Museum of Natural History is quoted as saying the following: If spiders disappeared, we would face famine. Spiders are primary ...
5
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2answers
838 views

Is comet ISON going to kill us?

I've just heard on the news that some comet named ISON is passing by the Sun. And they said that it will split and then it may hit us. They are citing Nostradamus prophecies and stuff. It appears that ...
8
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1answer
1k views

Does human survival depend on bees?

I see several websites claiming that without bees, mankind will be extinct in four years. Does human survival depend on bees? Citing Albert Einstein's saying to the effect that mankind would ...
13
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1answer
68k views

Have leap days confused the calculated date for the “end of the Mayan calendar”?

At the beginning of the 2012, I predicted that we would see a number of false debunkings of the Mayan Calendar Apocalypse, which would depend on their own misunderstandings of the Mesoamerican Long ...
2
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0answers
424 views

Could a global nuclear war damage planet earth structurally in a significant way? [closed]

Assuming that a global nuclear war would mean use of the whole global nuclear arsenal, is it possible for a global nuclear war to release enough destructive energy to damage our planet in a ...
45
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5answers
5k views

Do we have enough nuclear weapons to wipe out all of humanity?

I have heard several claims that we have enough nuclear weapons to wipe out all of humanity, but has anyone actually done an exact calculation of whether we do? The claim includes: All of the ...
12
votes
3answers
714 views

What risk do pole reversals pose to human civilization?

What are the chances that the magnetic poles of earth will switch during the next decade? If the event were to occur, what would be the effect to our civilization? Would computer hard drives get ...
8
votes
2answers
2k views

Does Fermi's paradox imply that civilizations will self destruct inevitably in a short time?

We should be able to estimate the number of detectable extraterrestrial civilizations in the Milky Way galaxy according to the Drake equation: By plugging in realistic values we obtain the result ...
6
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1answer
299 views

Is there an amphibian mass die off and if so, what is causing it?

http://frogmatters.wordpress.com/2009/02/20/scientists-scramble-to-solve-amphibian-death-puzzle/ Are there thousands of species dying off due to a chitrid fungus? I tend to be very skeptical of this ...
28
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4answers
4k views

What is going to happen in 2012?

The Mayan calendar completes its 5,125 year cycle, on 21 December 2012. Is there any evidence they foresaw the end-of-the-world?