Gas prices are down and sales are up, and greenhouse gas emissions from transportation, the largest source of the state's emissions, are up, even though overall they dipped. In addition to increased driving, sales of EVs and hybrids dropped.
"Recently released figures show that even as statewide greenhouse gas emissions fell slightly between 2013 and 2014, emissions from the transportation sector rose by 1 percent," reports Kate Galbraith for the San Francisco Chronicle.
Transportation accounts for 36 percent of California’s greenhouse gas emissions, more than any other economic sector, so taming it will be vital from an environmental standpoint — and hard.
Unfortunately, "2014 is the most recent year for which [greenhouse gas emission] figures are available," so the numbers don't show the full effect of low gas prices as gas prices began their steady descent in July of that year. Gas prices are reported daily by the AAA, and gas sales monthly and quarterly by the State Board of Equalization.
“One of the reasons it’s very tough to reduce emissions in the sector is that there are tremendous market barriers to clean transportation solutions,” said Simon Mui, director of the California transportation program at the Natural Resources Defense Council. Such barriers include volatile oil prices and inadequate infrastructure, he said.
It appears that by "infrastructure," Mui is referring to electric vehicle charging and fuel cell filling stations, not bus routes, light rail, or bicycle lanes.
Right now, low gas prices appear to be the biggest barrier. Prices across the state are down by  percent since a year ago [as of July 8], according to the American Automobile Association. (It may not feel that way to Californians, who pay gas prices that are considerably higher than the national average — a subject that recently caught the attention of California’s attorney general.)
On July 8, gas prices in California averaged $2.90 compared to the national average of $2.25, over 22 percent higher.
People are taking advantage of cheaper gas to drive more. Sales of gasoline in California were about 2.6 percent higher in the first quarter of this year than the first quarter of last year, according to the State Board of Equalization [PDF].
People are also are favoring gasoline-fueled cars over alternatives. Electric vehicles and hybrids (including plug-ins) respectively accounted for 1.4 and 6.2 percent of all new-car registrations in California in the first quarter of this year, compared with 1.7 and 7.2 percent in all of 2015, according to the California New Car Dealers Association.
In December 2014, Planetizen posted that California fuel consumption rose for the first time in eight years. The trend continues.
Despite these headwinds, [Gov. Jerry] Brown has nonetheless stated his goal of cutting vehicles’ gasoline use in half by 2030. It’s a stringent target that would affect automakers, refiners and virtually every sector of the economy, and state lawmakers last year balked at writing it into law. Brown’s hopes rest partly on federal standards aimed at increasing vehicles’ fuel economy, as well as a variety of California programs to to nudge consumers toward more environmentally friendly options.
In addition to the Clean Vehicle Rebate Project run by the Air Resources Board, Galbraith includes two market-based measures: cap-and-trade that adds about 10 cents to a gallon of fuel and the low carbon fuel standard that will reduce carbon intensity of motor fuels 10 percent by 2020.
Vehicle miles traveled (VMT).
In December 2014, Planetizen posted about an increase of "2.6 percent from December through November of 2013 according to estimates from the California Department of Transportation [Caltrans]."
Caltrans' most recent year for VMT records is 2014, and the upward trend continues. Travel on California state highways increased 2.64 percent over 2013, according to Caltrans' 2014 Traffic Volumes booklet [PDF].
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