CNN: There are still piles of bricks and rubble on countless streets in Greensburg, Kansas, a year after a tornado demolished more than 90 percent of the town. On May 4, 2007, a ferocious twister blasted Greensburg, Kansas, killing 11 people in the town of 1,400. 1 of 2 Yet what is happening in the city’s rebuilding process may not only re-invent Greensburg but provide a model for "green" building everywhere. Just a week after the deadly tornado hit May 4, 2007, a …