Mirai Shounen Conan

The attempt by a number of people to flee to outer space failed. Their spaceships were forced back to the earth and vanished with their hopes shattered. But one of the spaceships narrowly escaped destruction and crash-landed on a small island which had miraculously survived the devastation. The crew members of the spaceship settled there, as if they were seeds sown on the island. After years, a boy was born. He was a new life in the desert, a ray of light in the darkness of the annihilated earth... (Source: AniDB)