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What controlled Earth's climate for the last 2,000 years: CO2 or the Sun? YOU judge. It's easy. Technical Report · January 2020
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What controls climate: CO2 or the Sun? YOU decide
GeoclasGca Ltd Technical Note 2020-2 30th Jan 2020 rogerhiggs@hotmail.com
Spend 3 minutes looking at these 3 graphs, by world experts, all published since 2010 & peer-reviewed, of: 1) solar strength, 2) global air temperature, 3) CO2 since 2,000 years ago (when the Romans invaded Britain) The measurement units (verIcal axis) don’t maKer. Which two graphs match best? 0
1) Sun’s output 2) Global air temperature
from proxies (e.g. tree rings), calibrated to post-1850 thermometer graph (HadCRUT4, not shown here; see source, below)
3) Atmospheric CO2
1000 AD Strongest solar Grand Maximum for more than 2,000 years, 1937-2004
2nd highest solar peak c.300 AD
About 100-year lag (due to ocean thermal inerIa; overlooked by IPCC) c.400AD warmth
2000
Sawtooth-style decline
Medieval Warm Period I
Medieval Warm Period II
Modern warmth does not yet exceed 400AD warmth LiKle Ice Age
Sawtooth-style cooling
Man’s industrial CO2 emissions began c.1850. Steep rise coincides, by chance, with highest solar peak for >2,000 years (Graph 1)
Slight rise; no sawteeth Sources: 1) Vieira et al. 2011 Astronomy & Astrophysics 531, A6, fig. 11; see also Chatzistergos et al. 2017 same journal; 2) PAGES2k 2015 Nature Geoscience 6, 339-346, fig. 4b; MacFarling et al. 2006 Geophysical Research LeDers 33, L14810 View publication stats