Clay PCB Tutorial - feministhackerspaces
very cool and interesting process with local clay and conductive paint sourced from waste silver
How to Escape From the Iron Age? | LOW←TECH MAGAZINE
"We need much more steel if we replace thermal power plants with renewable ones. Because there is not enough steel scrap available, we can only produce that extra steel from iron ore in blast furnaces burning fossil fuels. To address climate change, we need to build low-carbon sources quickly and in great numbers. However, to achieve circular material flows and build low-carbon power sources from scrap and renewable electricity, we would have to do the opposite: slow down the development of a low-carbon power grid."