How will be the Earth destroyed?
the most definitive or probable answer for the current times would be a nuclear fallout which may result from a global war.but i feel the tensions have now decreased slightly with the ongoing peace talks btwn north and south korea and the denuclearisation of the korean Peninsula.in the same way i feel that the war in syria will also come to an ens soon.if though things dont go as planned a nuclear fallout is inevitable which will surely wipe out as large population of the http://earth.in the words of dr Albert Einstien:"I do not know with what weapons will world war 3 be fought but world war 4 will be fought with sticks and stones.
The highest probability of the Earth being destroyed is when our Sun puffs up into a red giant and we are consumed by the Sun. That is, if "nothing " else gets us first, like a gamma ray burst direct hit, or a rogue planet, a comet, or large asteroid hits the Earth first.
There are a million plus ways, to die in the Universe.