There really is no such thing as “Clean Coal.” Mining coal destroys mountains, and often kills the miners.  Burning coal releases tons of carbon into the atmosphere and the oceans, and even if you could sequester the carbon, burning coal releases other pollutants, including mercury into the biosphere. The mercury makes its way into fish. This is why people, especially children and pregnant women, should not eat a lot of tuna or swordfish.  Wind, solar, geothermal, ocean current, and “negawatts,” on the other hand, really are clean energy.  Offshore wind turbines don’t release pollution. On the contrary, they create artificial reefs, which enhance fish habitat. This is also good for fishermen, the economy, etc.