By Debra Kahn, E&E.

Proposed amendments to the first-in-the-nation regulation would tweak the compliance targets through 2020 and adjust emissions scores for various fuels, as well as set the program on course to extend to 2030. That raised industry's ire at a California Air Resources Board hearing yesterday in Sacramento.

The standard is intended to reduce the carbon content of fuels by 10 percent by 2020. Fuel producers and importers have to either adjust the blend of fuels they offer to reach the target or buy emissions credits in a state-created system. In addition to California, Oregon and Washington state are considering similar policies.