Paint the World White

In a 2009 speech.  DOE Secretary Chu wants to paint rooftops white or some lighter color to save the planet.  Not one mention of the $$$ to do this or the environmental damage to get that much TiO2, if there is that much TIO2 or the economic cost of that much displacement.  Truly, getting a Nobel in one area doesn't prevent you from being a total idiot in another.