Summer Rayne Oakes is an American fashion model, environmental activist, author, and entrepreneur, known as the world's first "eco-model". Oakes grew up in rural Pennsylvania, where her concern for the environment began early. She studied ecology in college, where she noticed that scientific papers on the environment received much less attention than popular media. She became a model in New York City, and insisted on only modeling clothing made from organic or recycled materials. These principles cost her work, but gained her notice and the title of world's first "eco-model".

Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks.