Coal is Extremely Dumb

Source: Coal is Extremely Dumb, Hank Green, 20:30, uploaded 2026-01-31.

Hank Green sets aside the climate argument because he thinks it already exists in public discussion. Coal releases carbon dioxide that remains in the atmosphere for a long time, and removing that carbon at a useful cost remains difficult. His target is a different claim: that coal might return as an important part of the future electricity mix. The video argues that coal is a poor technology even before its climate cost enters the calculation.

The turbine coal cannot use

A conventional coal plant burns fuel under a boiler. The heat boils water, the steam expands through a turbine, and the steam is then condensed so that the pressure difference continues to move the turbine. The arrangement works, although it uses only the heat produced by combustion.

Natural gas can run through a combined-cycle gas turbine. Burning methane produces hot water vapour and carbon dioxide, which expand and drive a first turbine. The hot exhaust then boils water and drives a second turbine. One unit of fuel supplies energy through expansion and heat, so the plant extracts more energy from the same combustion process.

Coal cannot use the same first stage easily. Its combustion produces particles, acids, and other contaminants that would corrode the turbine. A plant can remove some of those materials with scrubbers, although the result is toxic industrial waste containing mercury, lead, radioactive material, and other pollutants. The mercury that enters fish can travel from burned coal through the atmosphere, ocean, plankton, and larger fish before it reaches tuna.

Green’s comparison is therefore technical before it is moral. A gas turbine is a more efficient machine for a fossil fuel, although methane leaks remain a serious climate problem. The United States has the engineers and the gas supply to build the more complex plant. Coal keeps its position through political language rather than through an engineering advantage.

Solids, timing, and water

Coal also creates a bad material-handling problem. Engineers prefer to move liquids and gases through pipes. Coal produces dust and requires conveyor belts, rail cars, and other systems for moving a solid fuel. That work adds cost and risk across the supply chain.

The plant itself has a timing problem. A coal boiler takes a long time to reach its working temperature, and rapid changes put stress on the machinery. Coal plants therefore run at a fairly stable output even when demand falls. The old electricity system could absorb more of that production because lighting used more energy at night. Efficient lighting has removed much of that demand, which leaves a coal plant burning fuel when the grid needs less electricity.

That inflexibility creates waste. The plant consumes more fuel, releases more pollutants, produces more industrial waste, and warms more water than a flexible system would need to do. Green points out that combined-cycle gas turbines also belong to a fossil-fuel system he wants to retire. His argument concerns the relative stupidity of coal in the period before solar power and batteries make both technologies unnecessary.

Water makes the difference visible. A coal plant obtains all of its electricity from heat, so all of the energy must pass through a steam and cooling cycle. The process draws water from lakes, rivers, or the sea and evaporates much of it. Discharge can raise temperature and salinity in the receiving water, which harms local ecosystems.

Only part of a combined-cycle gas turbine’s output comes from the heat stage. It therefore needs less cooling, and air-cooling or other water-saving systems become easier to justify because the efficiency penalty applies to a smaller share of the plant. Green gives a range rather than one fixed number: such plants can use a third as much water, and in some designs a fifth or a tenth as much.

A technology caught in a culture war

Green treats the return of coal as an example of policy following discourse instead of expertise. The argument works through an identity signal. If a person treats every change from the 1980s as “woke”, then support for coal can become a way to oppose an imagined enemy. The engineering question disappears inside a conflict over loyalty.

The same pattern can reach across political camps. Leaders can choose a belief because it harms an opponent, even when the belief contradicts the knowledge of the people who run power plants and build electrical grids. Green’s frustration comes from the fact that this strategy works. A claim does not need to be technically sound if it fits the emotional shape of a culture war.

He compares coal with incandescent light bulbs. Incandescent bulbs were a useful improvement over burning whale oil, yet they became a poor choice once more efficient lighting existed. The point is historical rather than absolute. An old technology can have been good in its first setting and still become an irrational choice after a better system arrives.

Limits

This note follows Hank Green’s technical explanation and political interpretation. The source gives no bibliography for its figures about water use, coal plants, methane, or the date of the last new US coal plant. Its comparison with combined-cycle gas turbines is a relative case for the present electricity system. It does not make natural gas a climate solution, and it does not compare coal with every possible generation technology.