It's hard to go wrong with A Toyota Corolla.
Battery technology may see earth friendly at first, but the cost to manufacture the batteries and the rare earth metals in the engines may counter act any benefit.
It's my understanding German Cars are designed to be recycled because of German Law, you may want to look into this.
Volkswagon Turbo Diesels are very fuel efficient, but you may not like the ride or styling. The best way to be earth friendly is to maintain your car and to drive it as little as possible.
Any car with 2 passengers is likely more earth friendly than a econobox with 1 driver.
SUV's are very earth friendly if used at capacity. Where I live I see people in big SUV's all the time driving alone. Makes no sense why they didn't just get a car.