Final answer:
William Rathje's Tucson "garbage project" found significant amounts of edible food waste in landfills, revealing insights into consumer waste and resource efficiency.
Step-by-step explanation:
One finding of William Rathje's Tucson "garbage project" was the discovery of significant amounts of edible food waste in the landfills. Rathje's research shed light on modern consumption patterns and waste management practices, challenging preconceived notions about what we throw away. This project illustrated that, contrary to common belief, households were discarding a substantial quantity of food that was still safe to eat, highlighting issues of consumer waste and the potential for improved resource efficiency.