Several of the men that contributed to the evolution of refrigerants were from America.Thomas Midgley Jr., who with the help of Albert Henne, discovered a nontoxic compound called a CFC. Sherwood Rowland, who along with Mario Molina (who was not American), discovered that the chlorine in CFCs was destroying the ozone layer. These are just a few, many people throughout history have tried finding ways to better the ways in which we keep our frozen foods frozen.