Zeke Hausfather's avatar

Zeke Hausfather

@hausfath.bsky.social

These new estimates are broadly in-line with others in the literature. For example, the IPCC AR6 assessed warming projections estimate that global temperatures will pass 1.5C in 2031 in a SSP2-4.5 scenario:

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Andy Zhang's avatar Andy Zhang @arkbolt.bsky.social
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This rather suggests that carbon budgets are more in line with Lamboll et al's update: www.nature.com/articles/s41..., rather than the budgets presented in SR1.5. 250 Gt left in Jan 2023 approximates to a 1.5C passing in 2030 or 2031.

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Zeke Hausfather's avatar Zeke Hausfather @hausfath.bsky.social
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@copernicusecmwf.bsky.social, using a linear regression over the past 30 years, finds a slightly later date of 2033. The difference between the regression and climate models-based approaches reflect an expectation of modest near-term acceleration in models: cds.climate.copernicus.eu/apps/c3s/app...

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