Each week at the supermarket, Aiko and her parents buy a lot of canned vegetables. The aluminum cans typically contain only a few servings of food. After learning about sustainability in her environmental science class, however, Aiko convinces her parents to buy vegetables in bulk-sized cans that contain many servings of food. Aiko reasons that this strategy will result in her family buying fewer cans and wasting less aluminum. How sustainable is Aiko's solution? Explain your answer. Then suggest a more sustainable solution to Aiko's problem.