They explain the choice this way:
"Greenery is nature’s neutral. The more submerged people are in modern life, the greater their innate craving to immerse themselves in the physical beauty and inherent unity of the natural world. This shift is reflected by the proliferation of all things expressive of Greenery in daily lives through urban planning, architecture, lifestyle and design choices globally. Greenery bursts forth in 2017 to provide us with the reassurance we yearn for amid a tumultuous social and political environment. Satisfiying our growing desire to rejuvinate and revitalize, Greenery symbolizes the reconnection we seek with nature, one another and a larger purpose."