Cherry trees decorated with light-emitting diode (LED) lights are illuminated along the Meguro River during the Megurogawa Minnano Illumination 2016 event at night in Tokyo, Japan, on Friday, Dec. 2, 2016. Organizers of an elaborate mid-winter light display running until January along the Meguro River in downtown Tokyo are going off-grid as a way to limit harm to the environment: Biodiesel fuel from used cooking oil collected from residents and restaurants in parts of the surrounding neighborhood is being used to power more than 420,000 LED lights along the river. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images
