Colleges in the US have added a new subject, “great chemistry”, to their curriculum today. “Green chemistry __51__ how we can develop products that won’t __52__ the environment,” explains Paul Anastas, director of Yale University’s Center for Green Chemistry and Green Engineering, opened at the beginning of this year. The American Chemical Society, __53__ approves more than 600 college chemistry programs, only lists about a dozen that teach green chemistry. But that __54__ is growing.Cambridge College in Massachusetts is offering “ an introduction to green chemistry” course this gall and is offering the nation’s first bachelor’s and master’s __55__ in green chemistry. The program will have classes in environmental science and even environmental __56 __and policy. These subjects are not __57__ taught to chemistry major.Employers __58__ the introduction of green chemistry. Businesses are increasing seeking graduates __59__ backgrounds in the subject because it can help them make or save money in he development and manufacturing of products. “We need people who can not only understand their place __60__, but also understand the worldwide perspective,” said Adam Peterson, a chemical division manager at Dow Corning Corp.

A. controversially
B. eventually
C. gradually
D. traditionally