Hey Pepsi: If CO2 is a dangerous pollutant, why are you still deliberately injecting it into our drinks?

Mad Hatter's Tea Party: PepsiCo Figures Tropicana’s Carbon Footprint - NYTimes.com

“The main thing is helping us figure out where the carbon is in the chain,” said Neil Campbell, president of Tropicana North America, a division of PepsiCo. While acknowledging that protocols for measuring greenhouse emissions are far from perfect, Mr. Campbell said, “you can end up doing nothing if you let that stop you.”
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Now, PepsiCo managers said they planned to work with their growers and with researchers at the University of Florida to find ways to grow oranges using less carbon. And they are starting to grapple with ways to teach the public how to interpret the carbon footprint of a product.

CO2 Injection at Pepsi Plant Using Membrane Technology On GlobalSpec

For the past 18 months, we have used a new, highly efficient membrane technology for beverage carbonation.