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I totally forgot where I heard it from. There is indeed a natural cycle on this planet, but a much longer one. It is every 20~30 million years the planet will go through a hell like ice age. It is much much colder than the recent one we had. I have not confirmed this hearsay though.
However, even a regular ice age could take out majority of the earth's population. Most earth's population can freeze to death directly. In some well developed countries although people have heat at home, the crops don't. Until we can produce all our food in closed facilities without the help of the sun, We will still depend on the weather to survive.
Another true scientific finding is, there had been several mass extinctions in the earth's history. Can we humans also survive it? With current level of technologies, I very much doubt it. Although I doubt no one can survive either. Just the total population will be reduced to extremely small number.
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