I've read that kilns used to produce the clinker are often fueled by burning waste like used car tires. Wikipedia speaks to it a bit: https://en.wikipedia.org

I've read that kilns used to produce the clinker are often fueled by burning waste like used car tires. Wikipedia speaks to it a bit: https://en.wikipedia.org/wiki/Cement_kiln#Alternative_fuels https://en.wikipedia.org/wiki/Cement_kiln#Alternative_fuels