Humans littered early
Though early homonids were adept tool makers, the concept of recycling the tools for multiple uses seemed to not hit them yet. A quarry in central India is surrounded by discarded Homo erectus stone tools, suggesting that the tools were used nearby and discarded after use. Though this stage of homonids were very humanlike in an ability to design and make tools, they were quite chimplike in a lack of ability to plan ahead. Chimps and other tool making animals also discard tools as an 'as needed' item.