Evolution of human organism
Carbon dioxide is the staple for all the living matter on the Earth. Plants take it from the air, animals eat plants, and people eat both. Huge percentages of CO2 in the air of ancient times have come down to our minuscule 0.03%. Absorption of this residue by plants may inevitably lead to end of life on Earth. I reported that at the World Geochemistry Congress in Moscow in 1972.