British Broadcasting Corporation. Natural History Unit.

This film should be lauded for preserving images of the wilds of nature while they were still around to preserve, the tacit message being it is up to humanity to save the planet from the ecological disaster of global warming. It follows three animal "families: on treks spanning continents and oceans: polar bears racing a melting icecap, elephants crossing a parched African plain, and whales swimming thousands of miles from warm-water breeding grounds...