Did you know that the fermentation process of beer emits quite a bit of CO2? If you're a homebrewer or go on brewery tours often, you know that the bubbling air lock or the bucket next to the giant fermenter at a brewery is helping to manage the CO2 emissions. Breweries often try to exist as sustainably as possible - giving away spent grain to local farmers, heat-exchanging mash tun water, and even installing solar energy panels. But what about the CO2 emissions?