依下文回答第 46 題至第 50 題Plastic wasn’t invented until the late 19th century, and production only took off around 1950. But today we have9.2 billion tons of the stuff to deal with. Of that, more than 6.9 billion tons have become waste. It is unclear how long itwill take for the plastic to completely biodegrade into constituent molecules. Estimates range from 450 years to never.Meanwhile, ocean plastic is estimated to kill millions of marine animals every year. Nearly 700 species have beenaffected. Some are harmed visibly—strangled by abandoned fishing nets or discarded six-pack rings. Many more areharmed invisibly. They eat microplastics, the bits smaller than one-fifth of an inch across.Since World War II, plastics have transformed our lives, mostly for the better. They have eased travel into spaceand revolutionized medicine. They lighten cars and jumbo jets, saving fuel and pollution. They extend the life of freshfood and save lives daily by delivering cleaning drinking water to needy areas. Now the growth of plastic productionhas far outstripped the ability of waste management, and the oceans are under assault.Governments and corporations have been making efforts to address the waste problem. Kenya, for example,joined a growing list of nations that have banned plastic bags, imposing steep fines and jail time on violators.Coca-cola announced a goal to recycle 100 percent of its packaging by 2030. These help at some level, but the realsolution is to stop plastic from entering the ocean. There are two fundamental ways industry can help. First, it candesign new plastics that are either biodegradable or more recyclable. The second way is to just collect the trash. Moreeffective and efficient garbage collection systems are necessary. We need garbage trucks to collect the waste on aregular basis so that it does not end up going all over the planet.
46 What is this passage mainly about?
(A) Plastic pollution in oceans.
(B) Species affected by plastic waste.
(C) Harmful effects of plastic products.
(D) Problems of plastic waste management.