The article explores ways to get clean energy from coal, even if coal usage in the U.S. doubles. Coal has challenges but can last many years. The focus is on mining low-sulfur coal, making coal cleaner, and using methods like gasification and combustion to generate energy. The goal is to find the most effective and economic method depending on the local conditions. Technologies like gas scrubbing and coal liquefaction are also discussed to use coal more cleanly and efficiently.