Earth

What type of energy sources can't be replaced readily within a 30-year span?

More Questions from Earth
What is the coldest, windiest and driest place on Earth?
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If you are going to Florida Bay from the everglades which direction would you travel?
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What rock was used for navigation by the ancient Chinese people?
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When does magma become lava?
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What type of boundary is displayed at the Mid-Atlantic Ridge?
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What instrument measures water vapor in the atmosphere?
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On which canal would a traveler find Port Said?
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Which is the largest planet in Earth's solar system?
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