Predictions as to end of the world

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Many people of ancient days as well as modern times had been predicting several ways as to how World will be eventually be destroyed. Possible ways given are 1) Solar Storm 2) Planet X 3) Pole shift 4) Third World War 5) Big meteorite attack I do not think any thing to happen in the immediate future. Out of the five given what do you think is the most likely one that would cause the end of the earth ? I certainly think Solar Storm had a better probability than anything else. Your Comments...