What is phase-down?

• A. Immediate ban
• B. No regulation
• C. Increase emissions gradually
• D. Gradual reduction (not total ban)

Answer: (D)

Phase-down is a policy approach that gradually reduces the use or production of a regulated chemical over time, using a timetable with progressively lower limits and milestones rather than an outright prohibition all at once. This lets industry plan, invest in safer alternatives, and adjust processes while steadily bringing down emissions or consumption. An immediate ban stops usage right away, which is not phase-down; no regulation leaves the substance unrestricted; and increasing emissions contradicts the goal of reducing harm. Real-world examples, like phasedown plans for refrigerants under international agreements, show how gradual targets guide a transition without sudden disruption.