The greenhouse gas Methane is 23 times more potent than CO2, and is what cattle produce while digesting food. A typical family car produces a comparable carbon footprint to the average dairy cow. There are some 260 million dairy cows on the planet and a total of 1.3 billion cattle. We have a U. S. patent (7820171) that suggests we can reduce or eliminate these emissions from cattle. If we can make it work for dairy cows alone we can take the equivalent of 260 million cars off the road.