The association between the color green and environmental friendliness is a combination of biological reality and psychological branding. Biologically, green is the color of chlorophyll, the pigment essential for photosynthesis and the hallmark of healthy, living plants and forests. This makes green the universal symbol for nature, growth, and renewal. Psychologically, humans perceive green as a "restful" and "safe" color, often associated with harmony and the outdoors. This connection was solidified in the 1970s with the rise of the modern environmental movement and organizations like Greenpeace, which chose the name specifically to link the survival of the environment with global peace. Over the decades, corporations have leveraged this association through "green marketing" to signal that a product is organic, sustainable, or natural. While this has led to the unfortunate trend of "greenwashing"—where companies use green imagery to mask non-sustainable practices—the color remains the most powerful visual shorthand for the "eco-friendly" movement, signaling a commitment to protecting the planet's biological resources.