While the Mini runs lithium ion batteries, Hyundai is using lithium polymer for a new gen of hybrid vehicles, deemed “Blue Drive.” By 2015, Hyundai says its entire fleet will do 35mpg. And in a green gimmick, Hyundai will link donations to reforestation efforts in Brazil’s rainforest to sales of its luxury Genesis Sedan. Even more gimmicky, Ford Fusion drivers will get a tree icon on their dashboards, which sprouts leaves when you drive modestly and loses leaves when floor it.