Transportation accounts for more than 40 percent of carbon pollution in Washington, D.C., which has vowed to reduce greenhouse gas emissions 50 percent by 2032 and to become carbon neutral by 2050. To meet these climate goals, Mayor Muriel Bowser signed the historic Clean Energy D.C. Omnibus Act at the end of 2018, requiring the electrification of public buses, taxis, and privately-owned vehicle fleets that carry more than 50 people. Half of those vehicles will have to be electric by 2030, with the percentage increasing every five years until it hits 100 percent in 2045. D.C. has also committed to work with neighboring states in the Transportation and Climate Initiative to develop a regional clean transportation plan.