An example of the fourth graders turning waste into treasure by hand is as follows:

Making paper airplanes from waste paper: cut the waste paper into the shape of an airplane, add decorations, and then fold the wings upward From now on, you can make a paper airplane.

Making paper balls from waste paper: Crush waste paper into small balls, which can be used to play games to practice your aim and shooting movements, or you can freely use them to form other creative crafts.

Making vases from waste plastic bottles: After cleaning the waste plastic bottles, you can decorate them with colored paper or painting paint to make a simple vase.

Make a toy house from waste paper boxes: Use large waste paper boxes to cut out doors and windows, apply paint or paste colored paper on them, and then add furniture, decorations, etc. to make a children's toy house.

Make rag dolls from scrap fabrics: Use scrap fabrics as a base, cut out the shape of the doll according to your own design, then sew and fill it with an appropriate amount of cotton or stuffing, and finally add the face and decorations.

Make handmade bookmarks from waste paper: Cut the waste paper into suitable sizes and shapes, which can be beautified by painting, decorative stickers or embroidery, and then fixed to the book pages using glue or tape.

Make handmade cards from waste paper: Fold the waste paper into cards of appropriate size, and then draw, stick or write blessings on them to create your own unique handmade greeting cards.

Benefits of turning waste into treasure:

1. Reduce waste of resources: Turning waste into treasure can reduce the waste of resources. Much waste contains useful materials or energy that would be wasted if not treated and recycled. Through scientific processing and transformation, waste can be reused to achieve effective recycling of resources.

2. Reduce environmental pollution: Reasonable disposal of waste can reduce the risk of environmental pollution. Certain wastes, if not disposed of properly, can pollute soil, water and atmosphere, posing risks to ecosystems and human health. By turning waste into treasure, the risk of environmental pollution can be reduced and the ecological balance maintained.

3. Save energy and reduce emissions: Waste treatment and recycling can reduce energy consumption and emissions such as carbon dioxide. For example, processing waste oil into biodiesel can replace the use of petroleum products and reduce oil consumption and carbon emissions. At the same time, clean energy and new technologies can also be used in the waste treatment process to further reduce environmental impact.

4. Create economic value: Converting waste into valuable resources can create economic value. Through waste treatment and recycling, new products or materials can be generated, providing employment opportunities and promoting economic development. At the same time, reducing the waste of resources and saving costs will also help improve resource utilization efficiency and corporate competitiveness.

5. Promote sustainable development: Turning waste into treasure is in line with the principles of sustainable development. Sustainable development requires protecting and maintaining resources and the environment for future generations on the basis of meeting current needs. Through waste treatment and recycling, we can reduce our dependence on natural resources, reduce energy consumption, and achieve sustainable and coordinated development of the economy, society, and environment.