template: ### Instruction: Rewrite this English sentence to give a better translation.
  
  ### English: At that time, I knew that if I wanted to make a difference in air pollution, I had to first get smart about air pollution and become a student again.
  ### English rewrite: What I knew back then was that if I was even going to try to make a difference, I had to get smart about air pollution first, and so I became a student again.