Coal, oil, these two things, in the last century, provided the energy needed for industrialization to gradually become estimates. The successive rise of Britain and the United States can not be separated from their contributions.

Especially before the age of automobiles arrived, coal became a big city in some countries in the 1920s and 1930s. In their eyes, coal was called black gold.

People who can dig this kind of gold, especially those who can occupy large coal mines to dig this kind of black gold, are now not only rich and simple, but also wear titles that go deep into all levels.

It's very simple to say that the...