To be fair, in order to produce co2 as a brewer, you must first have a sugar source for the yeast to eat. This is typically grain, which captures the co2 from t

To be fair, in order to produce co2 as a brewer, you must first have a sugar source for the yeast to eat. This is typically grain, which captures the co2 from the air using solar energy. Farming clearly also has an impact on the environment requiring energy and water to produce and transport, but the co2 locked up in that grain would be released to the environment most of the other ways that grain could get metabolized. Seems like not that bad of an outcome really.