Draw a cartoon character that represents a sustainability advocate. They have messy hair, big brown eyes, and round glasses. They are wearing a white shirt with a logo on the right chest—a leaf wrapped around a circle. Their pants and shoes are simple but well-maintained. They have a slim figure with an upright posture, exuding energy and determination. Their facial expression is friendly and charismatic. Use shades of green to symbolize their connection to nature, and an overall vibrant and lively color palette.