I am all for fact finding, but it does require being clear about what you are specifically talking about. I have no idea what "climate pollution" is supposed to mean, is it exclusively CO2? is it CO2 and methane? Does it cover water contamination? Does that water contamination include temperature as a factor? Is water redirection counted? Is particulate matter released into the air included. Is it more or less important than particulate matter released into water. What about the make-up of the particulates?

And if you do accept any set of those things, When they talk about the top one , there is an assumption that there is a known way to rank all of those things. Show me that before you make a claim that one outranks another, otherwise we are talking about an imaginary scale.