If carbon dioxide is so devastating to crops, I wonder why people would go well out of their way to "enrich" an actual greenhouse with extra peak and baseline CO2:
Carbon Dioxide Enrichment:
Normal atmospheric CO2 concentration is ~370 ppm, however, experience indicates that some plants prefer up to 2000 ppm CO2 (approximately five times normal). In the Perpetual Harvest system this increased level is maintained for only 3 hours in the mid morning. During this 3 hour period, the plants store CO2 that will be used to boost plant growth later in the day after CO2 level has returned to normal. CO2 is primarily produced by a flame (propane or natural gas) CO2 generator. The flame can serve as a ‘peaking CO2 generator’ and baseline CO2 levels could be provided by decomposing compost or other continuous low producing sources. A digital CO2 monitor determines when CO2 generators will cycle, and also serves as an alarm for humans to take precaution when in the greenhouse during the high CO2 period .
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