Mars on Earth

The world's energy is running out and we need to know if man can send others into space, asleep and know that they will awaken once they end their journey. Two people, friends a man and a woman are willing to take that chance and sleep, then awaken in 6 months. But when they do awaken they find out that all they knew is gone, their friends, family and the world as they know it, are no more. Why, what happened? They travel on a world that is no longer alive, to find out what happened, why are all the people gone? And more importantly how will they survive on a world dead as Mars.