Final answer:
The environmental costs associated with CTL, or liquefied coal, include large demand for water, energy, land degradation, and trace metals released during combustion.
Step-by-step explanation:
The environmental costs associated with coal-to-liquid (CTL) technology, or liquefied coal, include several negative impacts on the environment. These include:
- A large demand for water.
- A large demand for energy needed to process coal.
- Land degradation in the United States.
- Trace metals released during combustion of CTL.
However, lower greenhouse emissions than regular coal, but more than petroleum is not one of the environmental costs associated with CTL. In fact, coal emits more carbon dioxide per unit of energy than petroleum and natural gas, making it a significant contributor to greenhouse gas emissions.