By Tony Barboza , Los Angeles Times.

California air quality officials are expected Friday to update a key initiative to fight climate change by reducing carbon pollution from gasoline and diesel fuel over the next five years.

The move by the state Air Resources Board is one indication of how California will use existing regulations, rather than new laws, to continue its climate change efforts after Gov. Jerry Brown and Democratic lawmakers this month were forced to drop legislative proposals to cut petroleum use and reduce greenhouse gas emissions.

By re-adopting its low-carbon fuel standard, California will require a 10% cut in the carbon intensity of transportation fuels by 2020.