Grain Belch

In producing loaves of bread, “ammonium nitrate fertiliser alone accounts for 43% of all the greenhouse gas emissions, dwarfing all other processes in the supply chain including baking and milling. These emissions arise from the large amounts of energy and natural gas needed to produce fertiliser, and from the nitrous oxide released when it is degraded in the soil. …
The agriculture industry’s primary purpose is to make money, not to provide sustainable food for the whole world. Profits for farmers and retailers rely on highly productive crops – which require lots of relatively cheap fertiliser. However the environmental impact of this fertiliser is not costed within the system and so there are currently no real incentives to fix things.” https://theconversation.com/weve-calculated-the-environmental-cost-of-a-loaf-of-bread-and-what-to-do-about-it-73643

Gluten is not the only gas-causing culprit.

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Ducketician

“Uneaten bread causes algal blooms, allows bacteria to breed and attracts rats and other vermin. … Swap it for healthier more natural treats like oats, corn, or defrosted frozen peas. And exercise portion control.” (http://www.theguardian.com/environment/2015/mar/16/dont-feed-the-ducks-bread-say-conservationists)

Water fowl concoction.