Basically, environmental law and econ are intertwined. Almost all econ models in the field are guesses at best and bullshit in reality. They usually assume a very low discount rate (basically how much would you give me today to get in the future i.e. I would bet 100 dollars on this if I got 150 dollars in a year). So the fields are absolute bullshit (mostly). Their models aren't good or accurate and they know this. In their models they always assume absurdly low discount rates (usually under 5%). It is all a house of cards. I literally ditched my classes then manipulated they system to take the class off my record.
tldr: liberals want you to give them 100 dollars for 101 dollars five years from now based on ill defined models that are volitile as is.