In Norway the receding ice sheet is proving to be something of a bonus for archeologists, who are finding some ancient and splendid finds, nicely preserved in the millennia old ice.
It occurs to me that you could make a game based around plundering these finds, where you find more and more sophisticated items. It would be an adventure mystery, where you uncover records of the civilization that left these artifacts behind. Eventually you discover that this lost, technologically advanced, people died out because of global warming, which led to a snap ice age and extinction.
It would be a bit like HP Lovecraft meets The Day After Tomorrow, perhaps with a dose of Monkey Island to lift the tone at times.
This post also appears on my Blue Lei blog.