A discussion about a recent discovery of the drop of solar light called
global dimming (the amount of photon energy reaching Earth) as relates
to water evaporation (pan evaporation rate), famines, global warming,
world pollution and climate changes. This research is not still
considered a fact among scientists but a worrying possibility.
http://www.realclimate.org/index.php?p=105
The Pakalian Group of Mexico