Utilization of coal?

Improve science and technology, make it burn fully, and convert waste into other chemical products, such as sulfuric acid and sulfurous acid.

Use that thing as little as possible. Although people still rely on it, it has no benefit except providing energy after use.

Crushing and liquefaction

Pay attention to ventilation when burning, leaving enough space for full combustion.

In winter, burnt cinders can be spread in some places that are easy to fall, and they are non-slip.

Improve science and technology, make it burn fully, and convert waste into other chemical products, such as sulfuric acid and sulfurous acid.

Use that thing as little as possible, although human beings still rely on it.