Vegetation creates breathable oxygen and as the Blight consumes more plant life and all available soil nitrogen, less breathable oxygen will be available for humans and animals, while Earth's nitrogen will be plentiful enough for the Blight to thrive, allowing it to spread farther and consume greater quantities of plant life. Brand explained that 80% of the Earth's atmosphere is nitrogen which humans don't breathe, yet the Blight is known to consume nitrogen for sustenance. Like the potatoes which led to the Irish Potato famine and the wheat in the Dust Bowl (during the Great Depression), corn was expected to die off as well. Professor Brand explains that wheat became extinct seven years before Cooper's arrival at NASA, and okra was due for extinction the present year. With no trees to slow down the wind, dust storms blow fiercely, and are strong enough to demolish abandoned houses. Vast, barren plains, bare mountains, abandoned cities and towns, and lifeless oceans. Earth is completely devoid of plant life, with little to no oxygen available. In the 2008 script, the final result of the blight is depicted. Corn remains the only viable crop, resistant to the blight, that can be grown and harvested. With common feed stocks no longer available, eating meat likely became a costly luxury around the world. In both versions of the script, a plant disease has ravaged the many sources of food, making wheat, potatoes, likely soybeans, and rice impossible to grow. Difficult times that we overcome is an exhortation to do likewise without losing hope even if all seems lost. With this in mind, the interstellar voyage is an allegory of the hard work needed to overcome great challenges. It's the main antagonist of the film, since it forced humanity to leave their own planet and the creation of the Endurance spaceship.Ĭonsidering the blight is a mere plot device, it could be seen as a parable of the hardships faced by humanity in its History and/or as an allusion to life during the Great Depression starting in 1929 and the Great Recession started in 2008. By the time Interstellar occurs, the last crops of okra are dying off, leaving just corn as the only viable food source for humanity. The Blight is a plague that has ravaged almost all the remaining food sources on Earth. Corn, one of the last surviving food sources
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