Dr. Frank O'Mara:

That is right, yes. As I said, if we keep the concentration of methane stable in the atmosphere, there is no additional warming, in theory. However, if herd numbers are rising and hence, emissions of methane are rising then there will be additional levels of methane in the atmosphere which will contribute to warming. If one looks at it over a short period of ten or 20 years, there is a lot of additional warming from that methane. This is where the importance of a stable national herd comes into play, as per earlier questions. Methane is a very potent greenhouse gas if it is rising. Obviously, if it is falling, it can make a significant contribution to cooling, which is the point we made in our document. If it is stable, it is having neither a warming nor a cooling effect.