text: Another Reason,fellow citizens about the advantages of limiting car usage are going out of control because it incates President obamas ambitions goals to curb the united staes greenhouse gas emissons, unveiled lastweek, will get a fortuitios assist from an incipient shoft in american behavior also recent studies suggest that americans are buying fewer cars, driving less and getting fewer licenses as each years goes by. the days without cars is part of an improvement campaign that began in bogotoa in the mid 1990s.