Graph of the Week Number 2

[rangerrebew]

Graph of the Week Number 2

See new posts
Conversation
Peter Clack
 
The red line for plant death on earth is around 150 ppm, implying a critical lower limit for CO₂ concentrations below which life would struggle to survive. The optimum CO₂ level for photosynthetic plants & algae is around 1,000 ppm, which last occurred when the first primates arose. Since then, CO₂ levels have been steadily declining. Yet it is still significantly higher than today's 400 ppm, after recovering from a low point of 180 ppm during the glacial optimum 26,000-20,000 years ago.  CO₂ has been trending downwards from 2,750 ppm 160 million years ago, when a coral diversity explosion occurred & when CO₂ levels were significantly higher. This downplays claims that higher CO₂ levels will damage coral reefs.

https://x.com/PeterDClack/status/1967400909484466473

[rangerrebew]

The great pyramid of Giza was built 5,000 years ago and is physically here so scientists can study it but still don't know how it was built or exactly why.  It took 20 years to build, a feat which could not be done today with all our current technology.  Yet, scientists are so sure of their knowledge of weather that it is currently considered "settled science" by many, even with the elements of weather being largely intangible except by instrumentation.  My, how science has "progressed."