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According to the study: "For five metals (arsenic, cadmium, lead, manganese and zinc), strong correlations of concentrations in uncultivated soils indicate a common source, suggesting that emissions from the complex may be a major contributor to elevated concentrations of these five metals in uncultivated soils in this area.

Joining Curiosity and Opportunity in 2020, the rover's payload will carry instruments that will cost about $130 million to develop. One of the major goals of NASA's next Mars rover is to process the atmosphere's carbon dioxide into oxygen for human breathing and potentially to oxidize rocket fuel. Scientists also hope to collect rock and soil samples that a future mission could bring back to Earth.

Will we be able to feed the Earth's growing population with the amount of tillable soil that we have left?