I would say that 60% of our CO2 comes from the heating process in the rock, and the other 40% comes from the actual fuel. We were following very closely all of the techniques, all of the technology, around capturing and sequestering CO2, but our main focus today is to invest in other technologies and to try, in effect, to produce more with the same amount or less.
So we have invested in various scrubbing techniques. We invested in an $80-million vertical roller mill, which allows us to take all of our stack emissions and use them for heating of our process, and it scrubs out; in fact, some of the CO2 ends up in the product. It is primarily a product called bran sand, which is from slag from the steel mills, and that becomes part of our process.
So that's what we are doing, in addition to all of the other technological things we can do. We have had a dramatic reduction in CO2 over the last few years, and we are looking forward to this proposed 20% reduction—