The major purpose of the Sustainable Development Goals (SDGs) is to end poverty, protect the planet, and ensure that all people enjoy peace and prosperity by 2030.
Source: Chapter 5, Sustainable Development Goals section
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The examiner expects the three-part purpose directly from the UN definition given in the textbook: end poverty + protect the planet + ensure peace and prosperity. Mentioning the 2030 deadline adds value. Do not write a long paragraph — one crisp sentence is enough for 1 mark.