A giant pile of empty plastic bottles, on their way to recycling, seen on a country road in the faraway suburbs of the great city of Tianjin. The bottles are carried by a mighty strong motorized tricycle. The pile is about five meters high, so tunnels will be a big problem.
Recycling is very good and such, but the engines of these tricycles tend to be extremely old fashioned and extremely dirty. The ride to the recycling facility and back will likely kill more penguins than a zillion plastic bottles save.