Coal liquefaction
While coal liquefaction has the potential to provide a significant source of energy, there are also significant environmental and economic concerns associated with the process. For example, the process releases significant amounts of greenhouse gases, contributing to climate change. Additionally, the process is energy-intensive and often requires large amounts of water, leading to concerns about water scarcity in certain regions. The high costs associated with coal liquefaction also make it less economically viable than traditional crude oil production.