Final answer:
Reusing old grocery bags for another shopping trip is encouraged as a conservation method.
Explanation:
Reuse is the conservation method that encourages keeping old grocery bags for another shopping trip. By opting to reuse items like old clothing, cloth grocery bags, and containers, one can prevent waste and reduce the emissions associated with producing new materials.
Learn more about Conservation methods here:
https://brainly.com/question/50116659
