This book provides a state-of-the-art overview of current achievements and future possibilities for the application of epigenetic and epigenomic techniques to the improvement of crops. Creating crops more resilient to the stresses caused by climate change will be an important part of a climate-smart and sustainable agriculture strategy for the future. All critical environmental stressors are explored: temperature, salt, drought, pollutants, pests, fungi, bacteria, and viruses. The exciting possibilities for the integration of epigenetic resources and technologies with plant functional genomics and the new field of precision molecular breeding in crops are discussed. Examples are shown of crops showing better growth performance, enhanced yields, more efficient nutrient utilization, and higher quality food production. The book reviews all aspects of epigenetics, epigenomics, and emerging RNA technologies and presents fundamental and advanced tools, showing their current applications in plant sciences, plant functional genomics, plant stress physiology, plant biotechnology, plant pathology, and plant breeding. The ethical, moral, and societal issues raised by these new plant breeding technologies are also discussed and future challenges are debated. This book is an ideal complete guide for students, researchers, experts, and professionals to overview this critical topic.