viz.

GLOBAL WARMING!

On the heels of yesterday’s post about the art (and absolute fidelity to reality) of scientific photographs, this story from The Guardian describes how scientists from the National Observatory of Athens are investigating sunset paintings “to work out the amount of natural pollution spewed into the skies by [volcanic] eruptions such as Mount Krakatoa in 1883.” Apparently the method has some validity:

They used a computer to work out the relative amounts of red and green in each picture, along the horizon. Sunlight scattered by airborne particles appears more red than green, so the reddest sunsets indicate the dirtiest skies. The researchers found most pictures with the highest red/green ratios were painted in the three years following a documented eruption.

via Boing Boing