(sarcasm)Yeah tourists eat the wrong food and it causes methane farts, and it causes them to breathe more due to the wrong food causing stomach pain from the gas and bloating which causes them to exhale more CO2. But don't worry, Al Gore says that if they buy carbon credits it will be like they never farted and never exhaled. Just don't pay any attention to that scam^H^H^H^H business opportunity resembling what the Roman Catholic Church did in the middle-ages when they allowed people to pay money to buy sin credits in order to get into Heaven. I mean both of them use guilt for profit, so it is a win-win deal. (/sarcasm)