"And people go gaga when they find 5 new species in the Amazon rain forest, " says Barton.

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The Amazon rain forest covers a huge area, roughly half as large as the United States, with about 60% of it in Brazil.

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Over the past decade, Brazil has cracked down on clear-cutting, especially in the biodiverse Amazon rain forest, reducing the rate of deforestation by 80%.

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Now suppose we made you either Indiana Jones or Lara Croft and dropped you into the middle of the Amazon Rain Forest and you had to get home?

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Growing crops to feed animals requires a lot more land, energy and fertilizer than growing them to feed people, he says: 70% of the land that was once Amazon rain forest is dedicated to grazing.

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