@frgough
Total energy reaching the earth is about 170 Petawatts and total energy consumption is about 15 Terawatts, a ratio of about 10,000 to one. Even if you adjust for energy lost in the atmosphere, absorbed by the oceans, conversion efficiency etc., the amount of land that would be needed for a 100% solar society is NOT prohibitive, and certainly not as conversion efficiencies rise in the future. Storage and transmission to certain parts of the globe could be issues however.
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