The headline above sounds like an oxymoron, given that Los Angeles has for 60 years come to represent everything brown and ugly as opposed green and bright in the environment. For "L-A" was the first city--and far from the last--to buy into the 1930s urbanist vision of dispersed sprawling communities linked by car-occupied freeways, popularized at the 1939 World's Fair in New York City.   The car and the wide, fast roads to accommodate it represented individual freedom, the escape from dirty, fetid cities into fresh countryside and wide open spaces, once the province of farmers and the elite. Unfortunately like most visions it overlooked the consequences, like smog, which began to be inflicted by cars on Los Angeles as early as the late 1940s, and traffic congestion that has proven to be impossible to build out of.   There is a plaque in the Los Angeles Union Passenger Terminal, (also known as Union Station used by Amtrak and the Metrolink commuter rail that discusses the deliberate freewayization of Los Angeles that destroyed what was the world's greatest mass transit network, the  Pacific Electric interurbans or 'Red Cars'. This figured as a subplot in the hit animated/real action comedy film 'Who Framed Roger Rabbit?'  The city also had an extensive narrow gauge urban streetcar system, which shared tracks with the Red Cars with inside rails for the trolleys.   Since the early 1990s "L-A" has been pouring money if by fits and starts into returning the 'Red Cars' now known as light rail transit or LRT, plus in subways, commuter rail, and bus rapid transit that have proven popular especially with high gas prices.