This book refers to the various biomass valorisation in various fields like bio-fuel; biodiesel; hydrogen production; energy application, environmental pollution using recent clean technologies. Clean energy technology refers to any process, product or service that reduces negative environmental impacts through significant energy efficiency improvements, sustainable use of resources or environmental protection activities. It covers all aspects of new and renewable clean energy production technology. The concept of eco-efficiency involves both ecological and economic aspects of sustainable agriculture. This book is of interest to teachers, researchers, scientists, capacity builders and policymakers. Also the book serves as additional reading material for undergraduate and graduate students of agriculture, forestry, ecology, soil science, and environmental sciences.