EconLog readers will already be familiar with geoengineering.  Now Obama’s science advisor says the idea on the table:

John Holdren told The Associated Press in his first interview since
being confirmed last month that the idea of geoengineering the climate
is being discussed. One such extreme option includes shooting pollution
particles into the upper atmosphere to reflect the sun’s rays. Holdren
said such an experimental measure would only be used as a last resort.

My suspicion is that this is classic Obama rhetoric: Say you’re open-minded, try not to impugn your critics’ motives, and then move forward with the standard demagogic approach.  I hope I’m wrong.