 Yeah. And I mean, it's amazing because like cement is critical. Like we need this building material to build on planet Earth. And so it seems like a kind of intractable problem. Right. But it's not like I mean, even fossil fuels, there's a backup. Right. With renewables. But with cement, there's no easy backup. I mean, this is what you're sort of discovering, I guess, in 2015, 2016, when you're looking into it.