DETROIT (Kyodo) The annual North American International Auto Show opened Monday in Detroit with automakers showcasing more environmentally friendly vehicles as the industry continues to rebound from its recent downturn.

While last year's show focused on industrywide green technology, this year automakers are emphasizing their brands as environmental technology becomes more mainstream.

Among Japanese automakers displaying their expanding lines of vehicles with green and fuel-efficient technologies, Toyota Motor Corp. introduced a new "family" of Prius hybrid vehicles, including a Prius plug-in hybrid. It also unveiled a larger Prius concept that can seat five and a compact Prius concept with improved fuel efficiency.