There is a great poster on how little space would be required to power the country and world with solar alone. There are a number of emerging technologies. One that has great potential is binary geothermal which uses existing but played out oil and gas wells to produce black start and baseline power.
"If someone told you there was a way you could save 2.5 million to 3 million lives a year and simultaneously halt global warming, reduce air and water pollution and develop secure, reliable energy sources – nearly all with existing technology and at costs comparable with what we spend on energy today – why wouldn't you do it?
According to a new study coauthored by Stanford researcher Mark Z. Jacobson, we could accomplish all that by converting the world to clean, renewable energy sources and forgoing fossil fuels."
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