[Nition]

> in carbonated drinks

Wouldn't that just put it back in the atmosphere though? I suppose it's better than using CO2 from some other source, but still.

[elric]

Yeah that's what I suspect. Apparently some of the consumed CO2 binds with calcium, some is burped out, and some presumably comes out the other end, but I couldn't find any numbers on how much ends up where.