What is the top action in the waste hierarchy?

• A. Prevention
• B. Reuse
• C. Recycling
• D. Disposal

Answer: (A)

Preventing waste before it’s created is the top action in the waste hierarchy. By stopping waste at the source, you avoid the need to use resources, energy, and emissions tied to making, packaging, transporting, and treating that item later. Prevention delivers the greatest environmental benefits and often the lowest cost, since it reduces overall material use and waste management needs. Reuse, recycling, and disposal are still important steps, but they come after prevention: reuse relies on already produced items, recycling requires processing and energy to recover materials, and disposal ends the sequence by simply discarding waste.