Interesting that Trump estimates the cost of the Paris Agreement in terms of the economy - 3.5 trillion in lost GDP by 2040 - but quotes the benefits in Celcius

Interesting that Trump estimates the cost of the Paris Agreement in terms of the economy - 3.5 trillion in lost GDP by 2040 - but quotes the benefits in Celcius - two-tenths of one degree by 2100. What exactly is Trump's estimate for the economic cost of climate change by 2100 if the Paris Agreement is not implemented?