California has adopted a sweeping set of measures, including some targeting the automotive industry, to reduce the amount of greenhouse gases emitted in the state to 1990 levels. CARB (California Air Resources Board) will promulgate the target-setting measures into specific regulations over the next two years. They will go into effect by January 2012. The measures are included in what CARB calls a scoping plan, which it approved Dec. 11. The scoping plan was called for under the state's landmark Global Warming Solutions Act of 2006, which requires the state to, by 2020, reduce greenhouse gas emissions to 1990 levels (427 million t of carbon dioxide equivalent). That will entail the state reducing by about 10% the average annual emissions over the 2002-2004 period. At 38%, the transportation sector, including cars and trucks, accounts for the largest portion of greenhouse gas emissions in the state, according to CARB.