Climate Sensitivity and the Response of Temperature to CO$_2$

TL;DR

This paper reviews evidence on climate sensitivity, showing that historical temperature and CO2 data support a higher warming estimate of about 2 K per doubling, challenging recent lower estimates.

Contribution

It provides an analysis of historical data supporting the IPCC's higher climate sensitivity estimate over recent lower claims.

Findings

Historical data indicates ~2 K warming per CO2 doubling.

Recent lower estimates (0.58 K) are unlikely based on data.

Transient response aligns with IPCC conclusions.

Abstract

A review of some of the evidence for the IPCC's conclusion that doubling CO$_2$ levels will warm Earth significantly, in contrast to the claims of a recent article$^1$. Simply looking at raw temperature and CO$_2$ data over the past 150 years gives a transient response of roughly 2 K per doubling, in good agreement with IPCC conclusions based on far more extensive analysis. The 0.58 K of Ref. 1 is very unlikely.