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Is Carl Sagan & Elon Musk wrong?
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Perhaps. Some top DDG responses to 'plants minimum co2':
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PATRICK MOORE condensed - Stanford University
www.stanford.edu/sep/jon/climate.html
The amount of CO2 in the atmosphere was reduced by about 90% during the last 150 million years. If this trend continues CO2 will inevitably fall to levels that threaten the survival of plants, which require a minimum of 150 ppm to survive.
Life on Earth was nearly doomed by too little CO2 - Watts ...
https://wattsupwiththat.com/2017/06/...oo-little-co2/
Our crop plants evolved about 400 million years ago, when CO2 in the atmosphere was about 5000 parts per million! Our evergreen trees and shrubs evolved about 360 million years ago, with CO2 levels at about 4,000 ppm.
Atmospheric CO2 Concentrations At 400 PPM Are Still ...
https://notrickszone.com/2013/05/17/...life-on-earth/
Plants really begin to suffer once CO2 concentrations fall below 500 ppm.
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It's possible Carl Sagan didn't know about
Chan Thomas' book Adam and Eve but if he did could he have said anything?