Thanks for the update @8cedrum. Wow that news on carbon cycling is extremely eye opening. I am off to read the full article now! If plants adjust their ability to absorb carbon relative to the amóunt in the atmosphere that is extraordinary! I wonder if they are also therfore able to adjust the amount of oxygen they can put out. Plants are just incredible - they are so here to look after all our needs it is truly quite humbling! Resteemed.