Air travel now accounts for about 3% of worldwide greenhouse gas emissions, and the sector’s emissions are rising: Global air travel more than doubled from 2004 to 2019. This is literally a first-world problem — most people on Earth fly rarely, if ever. By some estimates, the 1% of humans who fly most often are responsible for half of all air travel emissions.
The California Department of Transportation (Caltrans) has awarded a team of researchers from the University of California campuses at Berkeley, Davis and Merced a two-year grant to simulate urban air mobility in the San Francisco area, and to draft regulations for this highly complex form of travel.
