Haiti is basically denuded, compounding aid problems.  As stated in an AP article, here in the Chicago SunTimes:

Almost everything has to be imported, even wood for building temporary shelters, because Haitians have denuded their hillsides by cutting trees for cooking fuel.

“If you see Dominican Republic and Haiti from the air, it’s really striking,” said Byrs. “Half of the island is green and the rest is dust.”

I’ll try to find an infrared satellite image to post. The vegetation differences shown in the IR band are striking.