Just an aside:
A blurb in this month's SN ( Science News, a bi weekly) hits directly on this subject of pathetic leaf efficiency. If you start with this:
https://www.windows2universe.org/?page=/earth/climate/sun_radiation_at_earth.html as the beginning to how powerful the sun really is.....
Most organic processes start with a low yourself value, then maximize efficiency with the energy that does make it into the system. The plant may not absorb a large percentage of the sun's energy and convert it into glucose- but once that energy is in the form of glucose, the plant utilizes the resource quite efficiently.
