For instance, in the movie "After Earth," opening in theaters Friday (May 31), a series of earthquakes, floods, tsunamis and other natural disasters makes the planet inhospitable to humans, who resettle on a new world called Nova Prime.
But although the movie may be pure fantasy, many scientists are worried about other perilous scenarios some of which are even scarier than anything that's been depicted on the silver screen.
From pandemic fungus to robot insurrection, here are 9 apocalyptic visions that scientists foresee. []
1. Global warming
The mother of all apocalyptic fears, climate change is the biggest threat facing the planet, many scientists say. Climate change could make extreme weather more severe, increase droughts in some areas, change the distribution of animals and diseases across the globe, and cause low-lying areas of the planet to be submerged in the wake of rising sea levels. The cascade of changes could lead to political instability, severe drought, famine, ecosystem collapse and other changes that make Earth a decidedly inhospitable place to live.
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