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How to Escape From the Iron Age?
(solar.lowtechmagazine.com)
This is a most excellent place for technology news and articles.
In Europe, even a single family home is now built using tons of steel. They build with brick, but the foundation, corner pillars, beams on top of walls are all concrete.
A few decades ago, reinforced concrete beams were only used in large buildings and infrastructure.
Not to mention the huge amount of carbon emissions resulting from cement production, for the concrete that steel is fixed in