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That is, renewable energy plus more efficient use will work as long as the 1st World population is low enough not to out demand the system.

Good wood furniture made from old growth trees is a multigeneration asset. The best quality furniture uses renewable glues and finishes like hide glue and shellac. Modern furniture can't hold a candle to this stuff.
Solar power that isn't bullshit:
Exowatt P3
Most of it is in a standard shipping container. Produces 25,000 kilowatts each.
Fresnel lenses heat a big ass ceramic brick in the container to 1,000°C. An industrial fan blows air across the hot brick. Hot air drives a Stirling engine.
Fresnel & Stirling systems are 200+ year old tech. Industrial fan what? 120?
24/7 dispatchable electrical power. 3 - 4 cents per kw.
Ceramic brick is good for 50 years continous operation.
They are striving to get that down to 1 cent over time and scale.
Everything is 100% made in America.
www.exowatt.com
https://www.forbes.com/sites/michaelshellenberger/2019/05/06/the-reason-renewables-cant-power-modern-civilization-is-because-they-were-never-meant-to/#12e32e27ea2b
The Reason Renewables Can't Power Modern Civilization Is Because They Were Never Meant To
Over the last decade, journalists have held up Germany’s renewables energy transition, the Energiewende, as an environmental model for the world.
“Many poor countries, once intent on building coal-fired power plants to bring electricity to their people, are discussing whether they might leapfrog the fossil age and build clean grids from the outset,” thanks to the Energiewende, wrote a New York Times reporter in 2014.
With Germany as inspiration, the United Nations and World Bank poured billions into renewables like wind, solar, and hydro in developing nations like Kenya.
But then, last year, Germany was forced to acknowledge that it had to delay its phase-out of coal, and would not meet its 2020 greenhouse gas reduction commitments. It announced plans to bulldoze an ancient church and forest in order to get at the coal underneath it.
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After renewables investors and advocates, including Al Gore and Greenpeace, criticized Germany, journalists came to the country’s defense. “Germany has fallen short of its emission targets in part because its targets were so ambitious,” one of them argued last summer.
“If the rest of the world made just half Germany’s effort, the future for our planet would look less bleak,” she wrote. “So Germany, don’t give up. And also: Thank you.”
But Germany didn’t just fall short of its climate targets. Its emissions have flat-lined since 2009.
Now comes a major article in the country’s largest newsweekly magazine, Der Spiegel, titled, “A Botched Job in Germany” ("Murks in Germany"). The magazine’s cover shows broken wind turbines and incomplete electrical transmission towers against a dark silhouette of Berlin.