pink point - life on destroyed earth

this is a story of a man who reaches on a mysterious planet with his hi-tech survival machine by a space accident. He is alone and has lost his memory even he dont know his name. The days passes and his survival machine get destroyed and he meets a girl who has discovered survival techniques on this planet. After reaching back to earth in the era 2850 something AD. He finds there are no trees no religions no history no millions of people no oxygen in environment over earth. He lives with his family and has a love story here on earth. You can start reading pink point novel by its earth section first.