I will start with my two pence worth. I have
managed to find out that approx half of
emmited CO2 is absorbed by natural processes.
There is the 50 year old graph of increasing
CO2 in the atmosphere. I wonder if the increase
of shipping over the period causes a small but
finite increase of damage to sea plankton which
could lead to the increase. This is at least
a factor that can accurately be quantised.
Secondly, is it possible a lone but well
calibrated anemometer in a rocky location may
show a definite increase in weather "energy"
over the years.