so it is called organic waste.
actually, we also have inorganic waste, the opposite to organic waste, including building waste, broken pottery and china, and cinder.
the last part is harmful and poisonous waste, such as used batteries, electrical apparatus and medical supplies. computers and tv sets are one part of electrical apparatus. you see, the old electrical apparatus can set off some dangerous rays and make the soil harder, even damage the under ground water. mobile phones are as dangerous as computers and tv sets. as we know, x-rays can be used to examine patients, but the x-rays machines are dangerous when they are thrown away without any treatment. they can’t be used to treat the sick, but they still can give off rays. for the normal people, they can be dangerous. so, we must think about this problem.
as waste has four sorts, we can sort them into each sort that they belong to. it’s convenient to treat them after they are sor