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I read about an Australian market gardener who said that with glass houses, to gain maximum plant growth he pumps in CO2 to a level of 1000ppm, and contrasts this with the warmists insistence that if CO2 levels reach 500ppm it's catastrophic for the planet.
How are the two things relevant? The only thing about what you said implies is that optimal co2 levels for plant growths will completely change the climate of our planet (killing many of said plants in the process).