Donkeys create unburned carbohydrates.
Yes they do and as such are an environmental menace. These "evil" carbohydrates will be utilized by microbes that will produce CO2, which is the evil of all evils.
However, if we capture all the carbohydrate waste it could be converted by other "good microbes" such as yeast into good organic molecules such as ethyl alcohol, also known as whiskey. Although the whisky when consumed will also convert to CO2 a considerable fraction of the carbon will be excreted as human waste and if buried in an anaerobic environment will be forever excluded from the environment and never converted into the evil CO2.
In short the fate of the world depends on converting donkey sh-t into drinkable alcohol.