Are Solar Roads the Highway of the Future, or a Road to Nowhere?

By some back-of-the-envelope estimates, around 0.2-0.5 percent of the world's land surface is covered in roads. This proportion is projected to increase by 60 percent by 2050. It's a staggering fraction of territory for one species to claim--and it's for transportation alone. But what if roads doubled as power generators? In China, one of the […]