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Michael Allen's avatar

Per your post it appears the IMF's analysis estimates climate-related damages last year to be about 2% of world GDP. This is at odds with some 20 estimates summarized in the UN FCCC's Intergovernmental Panel on Climate Change WG2 AR5 (2013) showing that net global economic impact from a 3 degree C temperature rise by 2100 will be 3% or less of global GDP -- far less than even a tenth of a percent per year shaved off annual growth. The summary concludes that for most economic sectors the impact of climate change will be small relative to the impacts of other drivers (medium evidence, high agreement) such as demographics, technology, relative prices, lifestyle, regulation, governance, etc. AR6 (2021) indicated low confidence that global aggregate economic impacts could be higher than the AR5 estimates.

There are good reasons to tackle climate change. But as you say, rigorous and honest accounting for externalities is needed, not inflating numbers to generate outrage.

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Waspi, Kevin G's avatar

"Oh, what a tangled web we weave, when first we practice to deceive!"

Sister Mary Cecil, O.P., 8th Grade, St. Thomas the Apostle Grade School, Crystal Lake, IL. 1968

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