because we have no clue how it will happen. But only thing we have seen it. The problem even is that future could be even more unknown because we have no clue how it will happen. But only thing we have is past. So how do I create water management situations really by looking at the past knowing that future is unknown? So this is the fundamental puzzle. It's a scientific puzzle as well as social puzzle. This is where you need to basically the question you are raising, okay in 1960 they didn't know about climate change. I don't know what will happen next 50 years. We did not know that COVID-19 will come really in 2020. It did and it changed the life significantly. So those are unknown and then we need to have some way to essentially deal with it. What is the next COVID going to come? We don't know. So what does that tell you? What tells you really the most of our understanding really from science is from physics. What physics tells us really that with classical physics I can essentially describe the world in a very interesting and very predictable way. But the problem with complex system is that they are not easily describable by classical physics or quantum mechanics. Say world is not deterministic