Car ownership is set to triple by 2050, trucking activity will double and air travel could increase fourfold. This book examines how to enable mobility without accelerating climate change. it finds that if changes are made to the way people travel, adoption of technologies to improve vehicle efficiency and a shift to low-CO2 fuels, it is possible to move onto a different pathway where transport CO2 emissions by 2050 are far below current levels, at costs that are lower than many assume. the report discusses the prospects for shifting more travel to the most efficient modes and reducing travel growth rates, improving vehicle fuel efficiency by up to 50% using cost-effective, incremental technologies, and moving toward electricity, hydrogen, and advanced biofuels to achieve a more secure and sustainable transport future. If governments implement strong policies to achieve this scenario, transport can play its role and dramatically reduce CO2 emissions by 2050.