University of Michigan Transportation Research Institute
A recent study found that changes in transportation patterns have resulted in a decrease in GHG emissions. The research, conducted by the University of Michigan Transportation Research Institute, looked at data from 2000 to 2013 and found that total passenger miles traveled (VMT) increased by 21%, while GHG emissions from transportation declined by 6%. The study attributed the decrease in emissions to a shift in transportation mode, with more people using public transit, walking, and biking and fewer people driving alone. In addition, the study found that the average fuel efficiency of vehicles has improved over time.