The EU has been putting more and more money into generating power from renewable sources like sun, air, and water, with the aim of reducing CO2 emissions and a gradual shift away from consuming fossil fuels. However, coal remains an important raw material in Europe. Unlike brown coal, hard coal is also used in other industries besides power production and is therefore traded and consumed by all EU countries except Malta (https://ec.europa.eu/eurostat/web/products-eurostat-news/w/ddn-20230622-2). Countries of Northern Europe, with Poland being dominant in this field, extract hard coal even 1000 meters below the earth surface. The extraction of coal from the earth is