I believe that @HalOstem is referring to the “Debunked Heartland Report” It is a co2 talking point.
However, I do put these jugs under plants, I do put them in my grow rooms, I do smell something natural when I open the door or go to my outdoor field. If I thought it was not having an affect I would not post it. I want people to hear what I have been told by hippie growers, not many science guys at the roundtable back then.
For Science: The Heartland Memo: Myths About Carbon “Fertilization”.
Oh and @HalOstem, if your goal is to be at overgrow, help overgrow with links to facts, great articles & good debate founded on the general passion for the weed and desire to help others overgrow.