Cow belch jokes aside, the first relevant thing to consider is how humans might come to be exposed to methane. read more
Understanding how humans might come to be exposed to methane, the next question is whether it is toxic. Methane is an odorless, tasteless flammable gas. (Natural gas delivered to homes for heating and cooking contains an odorant to enable detection of gas leaks.) That alone presents a danger to life and health. read more
Although methane on its own isn't poisonous, it has the potential to become poisonous when mixed with other substances. That potential exists when natural gas, which is 97% methane, is burned in houses, offices and businesses. read more