BMW is now a century old. To celebrate, the brand has unveiled a concept car that emits nothing from its tailpipe and can drive itself. The automaker hasn’t said just how the Vision Next 100 concept manages to go emission-free, but it did talk a lot about the car’s exotic materials and construction. DON’T MISS: BMW’s first electric car (video) For instance, the car’s entire windshield is an augmented reality display. In place of an…