How expensive is it to limit global warming to less than 2°C?

The IPCC reports that the median cost to limit warming to less than 2°C corresponds to an annualized reduction of economic growth by 0.06%, relative to a baseline annual growth of 1.6-3%

https://www.ipcc.ch/site/assets/uploads/2018/02/SYR_AR5_FINAL_full.pdf

If the world economy would grow 1.6% the world economy in 100 years would be 1.016^100=489% the size of today’s economy.

With measures in place to limit warming to 2C, growth would be 0.06% smaller – i.e. 1.54%.
The world economy would then ‘only' be 461% of the size of today.

In case the world economy would grow 3% per year the world economy in 100 years would be 1.03^100=1922% the size of today’s economy.

With measures to limit warming to 2C, growth would be 0.06% smaller – i.e. 2.94%.

The economy would then ‘only' be 1813% the size of today.

In the quote above the IPCC only looks at the spending required to keep warming below 2°C.

But of course such a policy isn't only a cost, it also has benefits. And we need to take the larger picture into account.

This is a passage from a text that I'm currently writing on it.