His point is that climate science is complicated.  Most people don't understand it so debating the science itself by non-scientists is pointless because it becomes a debate about the consequences of the science, not the science itself.  This administration is doing all it can to remove scientists from the debate so that the science itself is subordinated to their idea of what they want the consequences to be based on the industries and billionaires they serve.  The thing is, the climate change process is quite visibly, obviously, and measurably underway - even the most casual curious person can see that.  So what I see here is a ploy to get us to ignore reality, not evaluate science that is already well equipped with peer review to evaluate itself.   On a subject that could kill the human species, ignoring reality is literally playing with fire.