don't you folks know that the cow fart/belch idea has been around for ages now, and is really taken seriously in some parts? Well, granted...this story deals with the end product of bovine processes, but still...and, some are worried that the cows may want to have a say in the matter...beware!
but, if you'd like to go into the matter seriously, here are the calculations ......hey! don't be lighting that match while reading this thread! You wanta blow us all to Hull?