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The paper investigates and reports problems on plastic waste and measures to solve them, and the developmental trend of main biodegradable plastics in the world. A large quantity of plastic waste neither rots nor returns to the nature even if reclaimed. The recycling system has not yet been established due to its low price. Therefore, countries are carrying out regulations on prohibition on the use of foamed polystyrene, compulsory use of degradable plastics, taxation on plastic bottles, etc. Among biodegradable plastics, a type of polyethylene blended with starch is legislated for its use in the U.S., but is met with opposition by environmental organizations because of its plastic powder remaining in the soil. Contrary to this partial degradability, the following are cited as completely degradable plastics: bioplastics based on microorganism, natural polymer based on plants and animals, and biodegradable synthetic polymer. Any of them, however, is still in the stages of research/development and commercialization. 376 refs., 28 figs., 37 tabs.