Keep threatening Iran with sanctions and wait for their answer!<br /><br />
Trust me on this, nobody wants a third world war but if westerners push the bounderies too far then boom!<br /><br />
Nuclear winter and Ice age for all!<br /><br />
Unfortunately after the bombs have dropped and the people have been mostly anilalated, the world leaders, who have gone underground, will form a "New World Order" and we will be ****** all over again so it's pointless!<br /><br />
I almost forgot about metiorites, they will cause mass damage but life will return but... <br /><br />
When the Sun goes "Supernova" we will be long gone!<br /><br />
I'm waiting for "Beatleguese to explode, it will change the constellation of "Orion" forever even though this has already happened, we will witness it soon!
The earth is going to get swallowed by the sun in five billion years.
When the sun runs low on hydrogen, it will expand and burn the Earth.
Natural Disaster like the Sun exploding
Probably the Sun exploding, but our world will end waaaaay before that