Why is use of coal declining worldwide?Multiple select question.Air pollution rules are getting stricter.Power plants using different fuels are easier and cheaper to operate.Alternatives are cleaner.There are minimal supplies of coal left.

The use of coal is declining worldwide due to several reasons:

1. Air pollution rules are getting stricter: Many countries are implementing stricter air pollution rules to combat climate change. Coal is a major source of air pollution, including sulfur dioxide, nitrogen oxides, and particulate matter. These pollutants can cause a variety of health problems and environmental damage. As a result, the use of coal is becoming less desirable and even prohibited in some places.

2. Power plants using different fuels are easier and cheaper to operate: With advancements in technology, power plants that use natural gas, nuclear energy, or renewable sources like wind and solar power are becoming more efficient and less expensive to operate. These alternatives also have the advantage of producing less pollution.

3. Alternatives are cleaner: As mentioned above, alternatives to coal like natural gas and renewable energy sources produce less pollution. They also contribute less to climate change because they emit fewer greenhouse gases. This makes them a more attractive option for power generation.

4. There are minimal supplies of coal left: While this is not entirely true as there are still substantial coal reserves worldwide, the extraction and transportation of coal can be expensive and environmentally damaging. In contrast, renewable energy sources like wind and solar power are virtually limitless and have a much lower environmental impact.

So, all the options are correct.