The chart shows nine pairs of rows. Each pair of rows includes the 2020 and 2050 CO2 Truck Trip Emissions against that of all vehicles for the OKI region and for each of the eight OKI member counties. CO2 truck trip emission values range from 26.8% (Campbell County's 2020 value) to 45.3% (Dearborn County's 2050 value) of all vehicle emissions.