In China, they aim to find new energy sources due to high oil prices by developing technologies that turn coal into liquid fuel to replace some of the petroleum used. Different methods like direct and indirect coal liquefaction are being studied, along with technologies to use coal tar oil efficiently.

Researchers have looked into the pros and cons of these processes and found various ways to make coal-based liquid energy sources more effective and sustainable. The goal is to improve these technologies to meet energy demands without relying solely on petroleum.