Climate change is being felt the world over and if global warming continues to increase the effects could be catastrophic. Some scientists and engineers are proposing radical, large-scale ideas that could save us from disaster.
The first three proposed ideas, featured in the film, look at reducing the power of the sun; thereby cooling the planet. The other two men in the program want to tackle the problem of excess carbon dioxide; the cause of global warming.
Most of the scientists are reluctant advocates of these ideas, and all believe we should be cutting down on our use of fossil fuels to heat our homes and drive our cars. But is time running out for planet earth?
Although these ideas might have unknown side effects, some scientists believe we may soon have no choice but to put these radical and controversial plans into action.