Definition: In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.
Input: Smog was invented in Los Angeles. It was. The name was invented. There was a fellow at Caltech and he came up with the idea and they called it smog.

energy