Greenhouse gases are the gases which absorb and emit radiant energy in the thermal infrared zone. This mechanism is the primary cause of greenhouse effect, which causes critical environmental issues and threats to ecosystems, biodiversity and human life present on Earth. Some primary greenhouse gases are methane, ozone, carbon dioxide, nitrous oxide and water vapor. The contribution of each of these gases to the greenhouse effect depends on their atmospheric lifetime, radiative forcing and global warming potential. The main causes of greenhouse gas emission are deforestation, burning of fossil fuels like oil, coal and natural gas, use of chlorofluorocarbons for refrigeration, livestock enteric fermentation, etc. This book presents researches and studies performed by experts across the globe on greenhouse gases and their effects on the environment. Different approaches, evaluations, methodologies and advanced studies on greenhouse gases have been included herein. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.