Below you can find the In 1930 thomas midgley discovered this refrigerant that has become an environmental hazard Jeopardy Words Answer. The answer to In 1930 thomas midgley discovered this refrigerant that has become an environmental hazard has 5 letters. This clue belongs to the Inventions & discoveries category and is part of Jeopardy Word Level 1727. If you scroll near the bottom you will find other clues and answers part of level 1727