As you can see from the charts below, Transportation, Petroleum Refining (Industrial), and Oil Extraction (Industrial) comprise close to half of the GHG emissions in California.  Reducing GHG emissions from transportation fuels is critical to meeting AB 32 goals of reducing pollution and improving air quality.

2012 GHG Emissions by Sector (from CARB)

2012 Greenhouse Gas Emissions by Economic Sector

2012 Greenhouse Gas Emissions by Economic Sector

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GHG Emissions from Industry (from CARB)

2012 Greenhouse Gas Emissions from Industry (101 MMTCO2e Gross Emissions)

2012 Greenhouse Gas Emissions from Industry
(101 MMTCO2e Gross Emissions)

(Click to enlarge image.)