Murry Salby – at Helmut Schmidt University, Hamburg, Germany, 10 October 2018
At 24 minutes, Salby notes the C13 level does not track with the CO2 level and is out of phase with the smaller CO2 fluctuations that are dependent of surface temperature.
Berry's carbon-cycle model is the only breakthrough in climate science since 1980 - Richard Courtney (2019, 2021)