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Coal, hard coal, wealth, heat source, energy, heat, energy storage, stone, pile, fuel, power, fuel, blue, solid, Royalty Free Stock Photo

A light bulb and Polish banknotes lie on a hard coal like a symbol of energy and wealth. Royalty Free Stock Photo

Smoking factory chimneys just behind a pile of black hard coal. Royalty Free Stock Photo

A pile of black coal burns and releases carbon dioxide into the atmosphere between other poisons. Royalty Free Stock Photo

Coal, hard coal, wealth, heat source, energy, heat, energy storage, stone, pile, fuel, power, fuel, blue, solid,

A pile of black coal on an background of blue sky. Royalty Free Stock Photo

A pile of black coal on an isolated background of blue sky. Royalty Free Stock Photo

Black coal is strewn on a prism on a blue background and among it there are polished diamonds. Royalty Free Stock Photo

Hard coal is one of the greatest treasures of humanity. It is an ancient energy warehouse. Thanks to it, we can generate heat and electricity, and it is also a threat because when burning, a greenhouse gas or carbon dioxide is created.