1. That has led to a reduction of CO2 emissions by approximately 425 tonnes per year
  2. That has led to a reduction in CO2 emissions by approximately 425 tonnes per year.
  3. That has led to a reduction of approximately 425 tonnes per year in CO2 emissions.

I remember reduction/increase is always followed by "in" to mean something is reduced or increased. But here I see reduction of, which is a puzzle to me. I tried my best to offer 2) and 3). I am wondering which is the right one.

  • I think you have the right idea in 2 and 3. – user3169 Oct 12 at 5:04

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