Sod roof...Cotonwood trees
There is a farmer in Texas that has a partial subterranean home, it was just it the free paper, he uses airplane windshields as skylights because cows would break the normal ones. The picture I got in my head of a cow on its back in the middle of this mans house made me laugh.
As for cottonwood trees, being deathly allergic to them, they need to all die!!!! Oh and they can take the fruitless mulberry with them when they go to h@ll the four on my property caused about forty thousand dollars worth of damage to the foundation and pipes, the developer planted them because they would grow fast...they are evil. Somethings just deserve death (I have relatives that prove this, so why not trees?)
P.S. yes I really am this annoying and offensive in real life, ask Dorel.