Waste is the unwanted leftover material after the end of a process. Nowadays, we can see waste everywhere, especially in the corner of schools. Based on its nature, waste is divided into two, namely organic and inorganic waste. The picture above is an example of inorganic waste. At SMK Negeri 4 Semarang, we can find trash bins in the corners of the school. An example is the trash can in the ward. This bin is made from used paint cans. These paint cans are inorganic waste that is recycled into trash cans. The types of waste in the picture are beverage bottles, tissue, and plastic food waste. These types of waste can be put to good use. Used bottles can be recycled into pencil cases, ecobricks, and others. Usually, students buy food wrapped in plastic more often. That's why there is a lot of plastic waste in school trash bins. But it is not uncommon to find garbage in the gutter, if done continuou...