1.   This, it argues, would put systematic financial pressure on motorists to buy cleaner vehicles and keep them tuned to peak efficiency.

2.   Browner is betting that improved technology can deliver cleaner fuels and cleaner vehicles at affordable prices.

3.   But electric advocates say hybrids should be seen as only a bridge to cleaner electric vehicles.

4.   --Increase the number of shuttle buses serving the valley, ultimately shifting from diesel buses to cleaner vehicles using propane or electric hybrid technology.

5.   It virtually creates its own market for cleaner vehicles and fuels.

6.   Ms. Browner is betting that improved technology can deliver cleaner vehicles and cleaner fuels at an affordable price.

7.   The group noted that several major cities, including Atlanta and Cleveland, have already converted to cleaner vehicles.

8.   The most important of these rulings will require automakers to build cleaner vehicles and oil companies to refine cleaner gasoline.

9.   The new air pollution rules will require automakers to build cleaner vehicles and oil companies to refine cleaner gasoline.

10.   Several major automakers and environmental groups have joined forces for the first time to support tax credits to promote cleaner vehicles and reduce fuel consumption.