Another new paper published in Earth and Planetary Science Letters casts further doubt on the paradigm that says CO2 has historically been a temperature driver.
Evidence from southern California’s Lake Elsinore indicates today’s regional temperatures (18°C) are 4-5°C colder than a millennial-scale period between 29,000 to 26,000 years ago (29 to 26 ka), or during the last glacial.
At the time, temperatures reached amplitudes of 22-23°C while CO2 concentrations lingered around 200 ppm, or less than half today’s values.
During both the periods between 31 and 24 ka and 14 to 9 ka, temperatures also were found to have abruptly risen (and fallen) by more than 10°C within centuries. These temperature swings occurred with little or no change in the CO2 concentration.
Those wide fluctuations are presumably Dansgaard-Oeschger events.
Glacial periods were not uniformly frigid in either space or time.
This is real world climate science, way more interesting than computer simulations.
Once again nature show (as evidenced by this paper) that the temperature of the atmosphere varies considerably and can be quite radical. No human involvement here just nature.
Now why is not any variation in temperature now not natural?
Certainly the temperature variation this planet has undergone over the recent 1,000 years appears to be well within normal natural limits and in all probability NOTHING to do with human effects. And nature will cope quite well with the tiny variation we’ve had over the lat 100 years, just as it has always done.
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