In 2012, combustion of gasoline and diesel fuels for use in cars and trucks resulted in approximately 23 million tons of greenhouse gas emissions – but not every county contributes equally to this regional total. Most notably, per-capita greenhouse gas emissions from fuel sales are half the regional average in San Francisco. The city’s “green” status is likely attributable to a robust public transit system, limited parking and a dense land use pattern. These factors decrease fuel consumption by shortening travel distances and making public transit, walking and bicycling more viable.
While comprising a relatively small share of the region’s greenhouse gas emissions from transportation, Solano and Napa counties lead the region in terms of the highest per-capita greenhouse gas emission rates from transportation. Given that residents in these rural and suburban communities tend to have longer trip distances, and that public transit options are limited, it’s not surprising that their greenhouse gas emissions from transportation are far above the regional average.