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: Since 2000, Texas has reduced harmful pollutants in the air like nitrogen oxide by 62.5 percent, and ozone by 23 percent--a reduction that is 12 percent greater than the national average.

environment