washingtonpost.com
August 26, 2008, Jordan Weissmann

In the early 1990s, all three major American automakers started building clean and efficient natural gas vehicles. But when a new federal law failed to create an expected guaranteed market, the momentum died. Today, only Honda sells a model in the United States -- and in minuscule numbers. Now, as drivers reel from the shock of high gasoline prices, natural gas vehicles are attracting renewed interest both on Capitol Hill and in Detroit. Proposed legislation and a new impetus at General Motors may bring a modest revival....

http://www.washingtonpost.com/wp-dyn/content/article/2008/08/25/AR2008082502546.html