*Doing Nothing About Climate Emergency Could Cost More Than All the Wealth in the World.*

That indicates the calculation is meaningless. Because if we're talking about the total destruction of humanity and a lot more, it is impossible and unnecessary to measure that in economic terms.

Which supports the point that the article is making: it is idiotic to say that avoiding total disaster is "too expensive". And foolish to ask, "If we save the world, will I still have a job?"