More than half of the world’s production of coal comes from:

Coal is a fossil fuel that is formed from the remains of ancient plants and animals. It is a major source of energy in many countries, and is used to generate electricity, produce steel, and power transportation.

The use of coal has been linked to a number of environmental problems, including air pollution, climate change, and water pollution. However, coal remains an important source of energy, and is likely to continue to be used for many years to come.

Here is a brief explanation of each option:

• (a) U.S.A. and Russia: The United States and Russia are the world’s second and third largest producers of coal, respectively. However, they do not produce enough coal to account for more than half of the world’s production.
• (b) China and U.S.A.: China is the world’s largest producer of coal, followed by the United States. However, they do not produce enough coal to account for more than half of the world’s production.
• (c) China and India: China and India are the world’s largest producers of coal, accounting for more than half of the world’s production.
• (d) South Africa and Australia: South Africa and Australia are the world’s fourth and fifth largest producers of coal, respectively. However, they do not produce enough coal to account for more than half of the world’s production.