This book presents the evolution of biodiesel technologies along with government policies of major biodiesel producing countries with their backgrounds, impacts, changes, and other energy forms. Biodiesel feedstock and biodiesel production technologies including green algae and methanol are presented as separate topics. Changes in the feedstock types and the corresponding technologies are presented, and their impacts on the biodiesel policies are explained. The life cycle analysis (LCA) in research and policy design of biodiesel is discussed and the findings are given for different feedstocks in terms of greenhouse gases, energy, and other impact categories.