Abundant Renewable Energy
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Currently all of civilization uses approximately 1/10000 of the available solar radiation energy impinging on the earth's surface. This means Kardashev Scale <<1, and ample room for everyone to thrive.
If we use photovoltaics (PV) to capture and use this energy, we are left with 1000x power available, assuming 10% round trip efficiency. Using Rooftop Area for PV,