CO2 Does Not Drive Temperature; Temperature Drives CO2

No Tricks Zone

New Study Finds The Post-1900 CO2 Rise Has Not Discernibly Altered The Greenhouse Effect

By Kenneth Richard on 27. November 2023

Excerpt:

Variations in the greenhouse effect are predominantly modulated by water vapor and cloud cover. CO2’s role in the greenhouse effect is so minor it cannot be discerned.

For decades scientists have reported that a CO2 concentration of about 300 ppm can only increase the downwelling longwave radiation (DLWR), or greenhouse effect, by about 1.5 W/m² at the surface. See, for example, the complementary studies by Ramanathan (1981) and Newell and Dopplick (1979).

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The AGW conjecture has been dead a long time ago, when will warmist/alarmists catch up to this reality?

FACT: NO Hot Spot exists.

FACT: NO Positive Feedback Loop exists.

That is the reality people needs to catch up on.

 

CO2 is good for the planet.
New Study: 2001-2020 ‘Global Greening Is An Indisputable Fact’ And It’s Driven By CO2 Fertilization
By Kenneth Richard on 29. January 2024

“Our results showed that the global greening was still present in 2001–2020, with 55.15% of areas greening at an accelerated rate…compared with 7.28% of browning.” – Chen et al., 2024
The CO2 fertilization effect has been dominant driver of the global-scale increase in “leaf area index” (LAI), or greening, since the 1980s. Scientists have estimated that CO2’s photosynthesis-enhancing capacity is 70% responsible for the greening trend (Zhu et al., 2016).

Using Advanced Very High Resolution Radiometer (AVHRR) data sources of questionable quality, some recent studies have suggested the greening trend has slowed or has even been reversed to browning since the 21st century began. As suggested, these data sources “should be used in caution” (Chen et al., 2024) as it is “well known that AVHRR-based NDVI and LAI have multiple sources of uncertainty,” such as “obvious artificial signals from the orbital drift.”

Using much more reliable MODIS data, scientists (Chen et al., 2024) can now say the LAI trend in the 21st century is robustly positive, and that 2001-2020 “global greening is an indisputable fact.”

The satellite data indicate 55.15% of global areas are greening “at an accelerated rate,” whereas just 7.28% have undergone a browning trend since 2001.

CO2 fertilization is still the dominant (75.63%) driver of Earth’s 21st century greening trend. Any drought trends in recent decades cannot overtake the positive CO2 fertilization effect, as all drought can do is slightly slow down the acceleration of the CO2-induced greening trend.



Image Source: Chen et al., 2024