Energy and environment are interconnected and an integral part of human society. The need for exploring energy resources (coal, oil, natural gas, coalbed methane, uranium, oil shale, wind, solar, hydro, and geothermal) to meet skyrocketing energy demands while protecting the environment (atmosphere, lithosphere, hydrosphere, and biosphere) has become obvious in recent years. As society relies more heavily on difficult to extract and non-traditional energy resources, it is often more challenging to ensure a low impact on the environment. This book offers a review of global energy supplies over a period of 30 years indicating a steady increase (>30%) in the use of natural gas (including coalbed natural gas, CBNG) driven by expansion of global economies and global population growth.