In response to this post (then again, maybe it was this one), reader Loretta E. Sheridan writes in to comment:

I have to wonder if those 23,000 just held their breaths, how much closer they would be towards achieving their goal of saving almost 41,000,000 pounds of carbon.
Humans emit roughly two pounds of carbon per day. So 46,000 pounds per day, which means in a little less than two and half years of holding their breath, those 23,000 people will have saved almost 41,000,000 lbs of carbon.