Carl_Sagan on our future

 I believe our future depends powerfully on how well we understand this Cosmos in which we float like a mote of dust in the morning sky.

http://en.wikiquote.org/wiki/Carl_Sagan

there is no future, says this man, similarly there is no future for us, if world is destroyed goo.gl/dgzyIC

Elon Musk on Extinction of earth