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AASHTO Journal

CARB Report Indicates Transportation Emissions Still Rising

The California Air Resources Board released an "inventory report" report on July 11 on greenhouse gas or GHG emissions in California and while CARB said GHG emissions in 2016 (the latest available year for data) dropped below 1990 levels for the first time in 14 years – "an achievement roughly equal to taking 12 million cars off the road or saving 6 billion gallons of gasoline a year," the agency noted – they continue to rise in the transportation sector.

Under Assembly Bill 32, passed in 2006, California must reduce its emissions to 1990 levels or some 431 million metric tons. According to its GHG Emissions Inventory report, the state emitted 429 million metric tons of climate pollutants in 2016; a drop of 12 milCarbLogo.pnglion metric tons, or 3 percent, from 2015.

Electricity generation posted the largest GHG emission decline among all industry sectors, according to CARB's data, dropping 18 percent in 2016, which reflects continued growth in renewable energy from solar, wind and geothermal sources – with solar electricity in all forms, including rooftop generation, growing by 33 percent.

Yet CARB pointed out that the transportation sector, California's largest source of GHG emissions, increased by 2 percent in emissions in 2016 due to higher fuel consumption.

Under the Obama administration, measurement of transportation-related GHG emissions were to be included in federal highway "performance measures," but the Trump administration put that regulatory effort on hold – with the Federal Highway Administration formally scuttling that initiative on July 2.

Yet California is still pressing ahead with its GHG reduction efforts. Senate Bill 32, signed in 2016, requires the state to go even further than AB 32 and cut emissions 40 percent below 1990 levels by 2030

"Emissions may vary from year-to-year depending on the weather and other factors," noted CARB Executive Officer Richard Corey in a statement. "However, this inventory demonstrates that our policies are working to incentivize GHG-free energy sources and ensure the state remains on track to meet its climate targets in 2020 and beyond."

Other details from CARB's GHG emission report include:

  • Carbon pollution dropped 13 percent statewide since peaking in 2004, even as California's economy grew 26 percent.
  • Per capita emissions fell 23 percent from a peak of 14 metric tons per person (roughly equal to driving 34,000 miles) in 2001 to 10.8 metric tons per person in 2016 (roughly equal to driving 26,000 miles).
  • Carbon pollution dropped 3 percent between 2015 and 2016—roughly equal to taking 2.4 million cars off the road or saving 1.5 billion gallons of gasoline and diesel fuel.
  • The "carbon intensity" of California's economy – the amount of carbon pollution emitted per $1 million of gross state product – has dropped 38 percent since 2001 and the state now produces twice as many goods and services for the same amount of GHG emissions.

Photo of I-10 highway traffic: Michael R. Perry

Questions regarding this article may be directed to editor@aashtojournal.org.

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