Thank you for the question.
The feasibility of retrofitting was one of the first things we looked at. In all cases of all these major technologies we described, it would require a major change in how the plant works--major changes in equipment, of space that was never conceived for things to go to.
We commissioned a study to actually look at what it would cost. It just becomes infeasible with the old plants, so we started focusing our technology on new plants. With new plants it's feasible, but with retrofitting old plants it's very difficult. If you can imagine, it's not just capturing a few percentages of one gas or another; it's taking virtually everything that's coming out of that plant and doing something with it, so it's a major change in the way they work.