Hi, David. Look there is, let me do that, from a U.S. perspective, but also from a global perspective, because it impacts also some of the refinery activities with respect to Catalysts and emission control. So first of all, here we believe that there was going to be some further stringent, kind of tightening on the regulations, can't cite any specific regulation changes. All I know is the CAFE standards, particularly is not going to be eased as it was during the previous administration. And we might revert back to further tightening the CAFE standards, which means further tightening the sulfur, desulfurizing and the emissions and which would be a great opportunity for Alkylation business. Just a note on the Tier 3 Sulfur Regulations that are implemented in 2020 towards the end, that that really brings in additional requirements for obtaining crease to a level where it probably triples the amount of alkylates that is needed to do that. And that's in practice right now. So we see that continue, and maybe growing further. And of course, we're going to probably see some more than executive orders. Probably, we're going to see more rules and regulations put in place and tighter application on further. It's going to be further and further sulfur reduction. And every time you remove sulfur, you destroyed octane, and you're going to have to rebuild it, which will probably be a positive factor. On a global basis, of course, you recall, people start talking about IMO 2020, which is a process by which also desulfurizing marine fuel that was starting to be implemented around China, particularly with the highest volume of application, that is recovering and moving forward. You also have the emission control rules, the Europe 6 and the China 6 and all those regulations that are going to be pushed forward continue to be pushed forward post-pandemic, to recreate that momentum of tighter regulation. So if you look at it as a whole, I think we're going to see a nice ramp-up of tighter regulation. That is the only answer that is there today to create that transition movement into cleaner air and cleaner fuel. It's just going to keep tightening. And for us as a business, if I connect it to, the more that tightening is, the more activity for us and the more business for us, and I think there is still a lot of room, it's not only the next couple of years, where we're going to see cleaner fuels, and cleaner air, and cleaner water, and all those demands and requirements. That's going to be a good tailwind for our business.