I helped a guy from the Waste Management branch today. I never fully understood J.K. Rowling's description of a character with a lion's mane of hair (descriptive, not literal) until I saw him. He had thick wavy brown hair spilling down his shoulders, and a long silver-streaked goatee.
Seems like a lot of people in environmental sciences are old hippies, or rugged outdoorsy types. Lots of silvery ponytails and Carhardt boots. The main exception are those who are in administrative positions--they tend to be clean-shaven (to the point of being pink) and wear weirdly colored polos.