Final answer:
The projected timeline for the United States to no longer require new sanitary landfills is uncertain and depends on various factors. Efforts will continue to be made to reduce waste generation and increase recycling and other sustainable waste management practices.
Step-by-step explanation:
The projected timeline for the United States to no longer require new sanitary landfills is uncertain and depends on various factors.
However, it is important to note that there is a global push to improve waste management and reduce the need for landfills in many countries. For example, in 2013, the United Nations issued a call to action on sanitation to eliminate open defecation by 2025, and the world is currently on track to eliminate it by 2030.
Therefore, while there is no specific answer for when the United States will no longer require new sanitary landfills, it is likely that efforts will continue to be made to reduce waste generation and increase recycling and other sustainable waste management practices.