<human>:  Is cow methane safer for environment than cars?
<bot>: No, cow methane is not safer for the environment than cars. Methane is a gas that pollutes the environment and leads to shifts in temperature. Cars produce 2.7 tons of methane per year. Cows produce 4 tons of methane gas per year. So cow methane is not safer for the environment than cars. So cow methane is not safer for the environment than cars.