But slashing greenhouse gas emissions as quickly as possible remains crucial to avoid even more devastating economic impacts after mid-century, they reported in the journal Nature.
Economic fallout from climate change, the study shows, could increase tens of trillions of dollars per year by 2100 if the planet were to warm significantly beyond two degrees Celsius above mid-19th century levels.
Earth's average surface temperature has already climbed 1.2C above that benchmark, enough to amplify heatwaves, droughts, flooding and tropical storms made more destructive by rising seas.
Annual investment needed to cap global warming below 2C -- the cornerstone goal of the 2015 Paris Agreement -- is a small fraction of the damages that would be avoided, the researchers found.
Staying under the 2C threshold "could limit average regional income loss to 20 percent compared to 60 percent" in a high-emissions scenario, lead author Max Kotz, an expert in complexity science at the Potsdam Institute for Climate Impact Research (PIK), told AFP.
Economists disagree on how much should be spent to avoid climate damages. Some call for massive investment now, while others argue it would be more cost-effective to wait until societies are richer and technology more advanced.
Poor countries hit hardest
The new research sidesteps this debate, but its eye-watering estimate of economic impacts helps make the case for ambitious near-term action, the authors and other experts said.
"Our calculations are super relevant" to such cost-benefit analyses, said co-author Leonie Wenz, also a researcher at PIK.
They could also inform government strategies for adapting to climate impacts, risk assessments for business, and UN-led negotiations over compensation for developing nations that have barely contributed to global warming, she told AFP.
Mostly tropical nations -- many with economies already shrinking due to climate damages -- will be hit hardest, the study found.
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