Peter Riva, in his June 14 article, Secrets and FACT of CO2, in the last sentence in the next-to-last paragraph, stated that CO2 was now 2% of the atmosphere, which would be 20,000 parts per million, ppm.
I was under the impression that the CO2 level was close to 400 ppm. Could Mr. Rivas please cite the source for his 2% claim?
Thank you,
Peter Burrows