The status of refrigeration fluids underwent a circle of changes in the 20th century. The invention of chlorofluorocarbons in the 1930s removed the health problem caused by leaks of toxic refrigerants, but by the 1970s CFCs became a serious threat to the enviornment. Throughout the century, JCE issues contained articles and short news bites about the fundamentals of refrigeration and the highs and lows of coolant fluids.
The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students.
Occasionally, collections of JCE back issues become available for donation to individual teachers, schools, or libraries. JCE matches collections with interested recipients. Recipients pay shipping costs or pick up the collection.