What does brewing have on the environment?

Answer 1

Draught beer's environmental impact can be 68% lower than bottled beer due to packaging differences.[134][135] Home brewing can reduce the environmental impact of beer via less packaging and transportation.[136]

A life cycle study of one beer brand shows that the CO2 emissions from a 6-pack of micro-brew beer is about 3 kilograms (6.6 pounds) -- including grain production, brewing, bottling, distribution and waste management.[137] The loss of natural habitat potential from the 6-pack of micro-brew beer is estimated to be 2.5 square meters (26 square feet).[138]

Downstream emissions from distribution, retail, storage and disposal of waste can be over 45% of a bottled micro-brew beer's CO2 emissions.[137]

The use of a refillable jug, reusable bottle or other reusable containers to transport draught beer from a store or a bar (where legal) can reduce the environmental impact of beer consumption (as opposed to buying pre-bottled beer).[139]

The above was taken from the Wikipedia.org article on beer.