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Growing potatoes on Mars: Ecological footprint

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If I can grow enough potatoes, I won’t starve. But how large an area do I need to plant? It’s a simple question in a complex and desperate situation. In the movie The Martian, an astronaut on a Mars mission is thought to have been killed in an accident and left on the red planet during an emergency evacuation by the rest of the crew. Mark Watney, the unlucky astronaut played by actor Matt Damon, must figure out how to survive. With four years to go before the next scheduled mission will arrive on Mars, but only enough food to last...
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