There are about 5,000 permitted food carts in New York City. Although people claim they are the backbone of the city, and as much of an urban icon as convenient stores in Asian cities, they are contributing to city pollution. Next year, 500 solar-powered food carts will fill the streets of the concrete jungle. Read on

At the main campus of Webster University in St. Louis, the United States, students, faculty and staff are enjoying a free power charge for their mobile phones and tablets without paying a penny! A new clean energy charging station installed with public mobile device chargers offers more than that. Read on