apologies to CCR but these wheels are not burning, they are cleaning up
From National Geographic
Baltimore’s harbor is cleaner than it has been in decades thanks to two anthropomorphic trash wheels pulling debris from its waters.
Mr. Trash Wheel and Professor Trash Wheel, the latter of which was installed in December, are solar- and hydro-powered trash interceptors based in Baltimore's Inner Harbor, clearing debris before it enters the Chesapeake Bay. Over a million pounds of trash has been pulled out of the water by Mr. Trash Wheel since it was installed in May 2014.