Another greentech challenge: the perfect dust filter

Just in time for our de REcession, the American West is having more dust storms. Maybe it's our generation's time for a Dust Bowl? Dust off your Woody Guthrie songbook.

California's Central Valley is already under warning from the Weather Bureau that dust storms are expected there. And Utah's getting dirty rain and snow right now.

There are greentech companies working on removing arsenic and mercury from water, pollen and greenhouse gases from the air, lead for all over the place. Could be time for the perfect dust filter.