2. The planet's energy resources
2.1 Renewable energy sources
We speak of renewable resources when nature makes them available to us continuously (on average) over the timescales of our civilizations. On Earth, most renewable resources come from the sun, where hydrogen nuclear fusion reactions take place.
Our star radiates a colossal amount of energy into space, of which the Earth intercepts a tiny fraction. The energy received fluctuates according to the rhythm of the day and the season,...
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The planet's energy resources
Primary energy consumption
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