Well, I think it's significant in terms, of course, of the straight carbon reduction and the demand from the industry itself.
United Airlines is one of our customers. It has announced that it's going to be a zero-emission company by 2040. It's a challenge when what you do is fly planes. One way it's doing that is by engaging with us. We've been supplying it with sustainable aviation fuel out of our California facility since 2016. Currently we use animal fats and recovered vegetable oils. We haven't even looked into taking food crops there, because of where it's located. Of course, using these second-use products out of a very heavily populated area is one sector that is growing.
On another board I'm on, down in the Advanced Biofuels Association, we've actually recently committed to do a feedstock study for just these purposes, to look at it in the greater scope. I can say it isn't just about existing crops, because those are going to be very important, but I think that new technologies with algae, with camelina, with cover crops, that's where the expansion is going to come. Right now that's where the primary value is going to be created, by putting them into biofuels. They're not going to be done without having these policy indicators to allow us to expand.
We're not just looking at the food for fuel debate. We're looking at where we can get lipids on a massive scale. Certainly all of these feedstocks are a piece of the puzzle, a part of the layer, but I think we will continually be searching to go to the lowest carbon feedstock we can to generate some very high yields in very small areas with the new crops and lipid-based oils that are available.