In the fourth chapter of the series looking at regulation changes from 2014 to 2021, Thierry Baritaud ? Scuderia Ferrari Head of ERS Turbo Systems - analyses the various stages of the hybrid turbo era, from the introduction of the Power Unit to the long path towards a more sustainable Formula 1. Subscribe ferrariworld: http://www.youtube.com/subscription_center?add_user=ferrariworld Follow us on Facebook http://www.facebook.com/ScuderiaFerrari Twitter http://twitter.com/ScuderiaFerrari and Instagram http://www.instagram.com/ScuderiaFerrari Ferrari Since 1947 http://formula1.ferrari.com