Thunderstone (1999)

The year is 2020. Fifteen-year-old Noah lives with his family in the futuristic underground community of North Col. The world above is a frozen wasteland after a massive comet strike destroyed all other life in the world including the animals. One night, he accidentally time travels to the future and finds himself trapped in the year 2085 in a desolate desert place called Haven with a group of children, the Nomads, led by Arushka.