Big-budget, special-effects-packed action double. In 'The Day After Tomorrow' (2004), global warming and the greenhouse effect have given rise to an abrupt climate change - with cataclysmic consequences for the entire planet. Dennis Quaid stars as Professor Adrian Hall, a paleoclimatologist who is fighting to save the world from a second ice age and all the natural disasters that herald it: floods, hurricanes, earthquakes and tornadoes to name but a few. But first, Hall must complete a more personal mission: his son Sam (Jake Gyllenhaal) is stranded in New York City where he was taking part in a school competition when the catastrophe began. As well as facing a perpetual onslaught of natural catastrophes, Hall must fight his way through the mass of humanity fleeing south into warmer climes. But can he reach his son in time to save him? In 'Independence Day' (1996), massive spaceships appear, hovering above planet Earth and the world stands in awe and wonder. This soon turns to terror as the aliens launch an all-out attack, devastating the planet. The survivors, led by American President Thomas J. Whitmore (Bill Pullman), decide to fight back.