For April 2016, the average weekly increase in CO2 levels compared with April 2015 is 4.16 ppm.

[NNadir]

3. Thank you for that post. It is certainly reasonable to expect. A widely cited paper from 2006...

...discussed saturation feedbacks. If you are interested, it is here: Climate–Carbon Cycle Feedback Analysis: Results from the C4MIP Model Intercomparison

It has been cited more than 1900 times.

A more recent publication touching on this situation is here: Phil. Trans. R. Soc. A 2013 371 20120006

From a purely chemical sense, one would expect saturation of the ocean - the main CO2 sink - would occur at lower pH, and the pH of the ocean, while it still remains basic, is in fact falling.

CO2 is less soluble in water at higher temperatures as well. This may also have bearing on the deteriorating situation.

I suspect that the rapid increase is partially tied to these kinds of effects, but I am also certain that we have made no headway whatsoever in addressing the increase in the use of dangerous fossil fuels.

Thanks again. Have a nice evening.