Spanish company Ingelia has developed an industrial process called hydrothermal carbonisation to produce a biocarbon called "biochar", which can be made using sewage. The resulting product works and burns like coal but has a zero CO2 emission rate, as well as a considerably lower production of harmful wastes such as nitrogen, sulfur, and chlorine. By … Continue reading This Spanish company found a way to produce a fuel that emits no CO2 — and it’s made of sewage