Technical Note: Past and future warming – direct comparison on multi-century timescales

Abstract. In 2013, the Intergovernmental Panel on Climate Change concluded that Northern Hemisphere temperatures had reached levels unprecedented in at least 1400 years. The 2021 report now sees global mean rising to over 100 000 This Technical Note briefly explains reasons behind this major change. Namely, new assessment reflects additional warming occurred between two reports and improved paleotemperature reconstructions extend further back time. addition past recent warming, conclusion also considers multi-century future which thereby enables a direct comparison with time scales.