This informative book offers a comprehensive exploration of critical reservoir parameters, including quantification techniques and interpretations for evaluating these reservoirs. Readers will also gain insight into the fundamental principles of simulating gas production from coal and shale reservoirs, as well as the key input parameters for building the best-fit reservoir model. Additionally, the book explores various aspects of storing captured CO2 in these reservoirs and their potential role in preventing global temperature increases beyond pre-industrial levels. Energy from conventional petroleum reservoirs and coal has been the backbone of global energy needs for a long time. However, depletion of these fossil fuel reserves, as well as their contribution to rising greenhouse emissions, has prompted a shift to renewable energy sources. Natural gas found in unconventional coal and shale reservoirs is increasingly seen as a greener energy option, emitting approximately 45% less CO2 than conventional sources. Furthermore, due to their vast availability and capacity to sequester atmospheric CO2, unconventional coal and shale reservoirs can facilitate the transition to renewable energy resources. With a focus on achieving temperature stabilization at 1.5°C, this book offers a valuable resource for those interested in renewable energy and mitigating climate change.