Introductory technical guidance for civil and geotechnical engineers interested in design for facilities and infrastructure in freeze-thaw soil conditions. Here is what is discussed: 1. GENERAL 2. DEFINITIONS AND THERMAL PROPERTIES 3. TWO-DIMENSIONAL RADIAL HEAT FLOW 4. ABBREVIATIONS.

s the rapid development of the world's economy brought serious environmental problems, the economy must accelerate industrial structure adjustment and development mode transformation to achieve sustainable development. A cleaner production mode based on cleaner technology is a crucial way to solve the conflict between economic growth and environmental protection effectively. In essence, cleaner production is a kind of production mode in which the environmental strategy of overall prevention is adopted for the production process to reduce or eliminate their possible harm to human beings and the environment while fully meeting human needs and maximizing social and economic benefits. Fossil energy and renewable energy have promoted the development of many emerging industries, such as the automobile industry, aerospace technology, modern production and processing, and modern transportation industry, and preventing waste production while increasing efficiencies in the uses of energy is a crucial issue. Specific measures include: • Using clean energy and raw materials; • Adopting advanced technology and equipment; • Comprehensive utilization; • Reducing pollution from the source; • Improving utilization efficiency; • Reducing or avoiding the generation and emission of pollutants in the process of production. This Research Topic aims to report the most important and latest technological advances in cleaner treatment technologies of fossil energy (such as oil and natural gas) and renewable energy (such as hydrogen energy and geothermal energy) and serves as a platform for addressing and discussing theoretical and practical cleaner production.