I attended a vehicle technology symposium organized by CARB last week. Personally, I learned a lot about emerging engine and transmission technologies, systems analysis needed to make it happen and so on. However, the 64K question is What is CARB going to do with it? Regulation proposal to address AB1493 could be expected in May 2004. AB 1493 does not allow things that will substantially alter the consumer behavior (fuel taxes etc.) The trouble with Greenhouse Gas Emissions is that the problem is not as straightforward as the one posed by criteria emissions, something that CARB has delt with successfully through technology forcing regulations. Doing so with GHGs will be much tougher.