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Presumably the health/safety improvement in high-tech greenhouses is that you can eliminate the need for pesticides and herbicides.

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different set of problems; equipment failures and mold's & fungus become bigger problems. it's not a closed loop since we need fresh co2 to trigger photosynthesis and nothing is 100% failure proof.

Seems like there's plenty of CO2 to go around. What's the issue?

Commercial greenhouse growers usually supplement CO2 up to Levels of 1000-1500 ppm and above.

The CO2 storage and distribution facility is one more technical component and there is one more dependency to the supplier of the liquid CO2.

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