1In the first study to look at what happens over the years to the billions of pounds of plastic waste floating in the world's oceans， scientists are reporting that plastics — reputed to be virtually indestructible — decompose with surprising speed and release potentially toxic substances into the 2Chemicals are an important aspect in our economy and serves with many However， when chemicals are not properly used they can create a problem with global There is the threat of chemical spills and also a possible use by Many chemicals are stored and processed at numerous If terrorists were to attack any chemical plants in the United States it would kill more than 2 million There is also a long-term threat of contamination that will affect both people and the These chemicals can contaminate the water and cause many illnesses to In 1962， Rachel Carson informed the public about the horrible effects that DDT had on the environment and health problems of But it took 10 years for the United States to ban this But not all chemicals pose a security To reduce the use of chemicals facilities are required to provide the public with annual chemical This has allowed our society to force these facilities to use these chemicals better and The Stockholm Convention on Persistent Organic Pollutants came into effect in May This treaty would ban or restrict the production and use of 12 hazardous There will always be an abundance of chemicals but their use needs to be lowered to make them less of a 3A captain of a ship drunkenly crashes a massive oil tanker along a reef and changes the physical and emotional world Chemical spills are major problems that plague the Strict government regulation is trying to aid with this problem， but governmental leaders face many Disposal of harmful chemicals is often difficult and Since chemical waste has destroyed the environment， steps are being taken to prevent further 看看，参考一下吧：
