Transport energy and CO2 : moving toward sustainability 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.&nbsp; It finds that if we change the way we travel adopt technologies to improve vehicle efficiency and shift to low CO 2 fuels we can move onto a different pathway &nbsp;where transport CO 2 emissions by 2050 are far below current levels at costs that are lower than many assume.&nbsp;. The report discusses the prospects for shifting more travel to the most efficient modes and reducing travel growth rates