Dust Bowl by USDAgov
If TheGardenLady readers have not seen the documentary The Dust Bowl by Ken Burns, you should. It chronicles one of the worst man-made ecological disasters in American history. (read this) I think it is MUST watching. You will see what planting just annuals in great expanses or overplanting with annuals in one area can do to our soil in adverse weather conditions like drought and heat. This Dust Bowl catastrophe did not last one day or one week or one month, like the destruction from Hurricane Sandy. This dust bowl disaster lasted 10 years.
We may not have known that we needed perennials to keep the soil intact and to help the environment when they had the Dust Storms, but by now we should know what can happen when we despoil our lands.