1922 Shock News: Higher CO2 Levels Needed To Feed The Human Race
March 17, 1922: 'WORLD’S GREATEST PROBLEM. Dr. Riedel conceived the idea of speeding up the growth of plants by giving them extra supplies of carbon dioxide...Tomatoes in the greenhouse supplied with gas weighed 175 per cent, more than in the other houses, and cucumbers show ed increase of 70 per cent.'
