Anyway, most of his talk concerned the "Sand Hills of Nebraska," although he did talk a bit about nature's balancing act with energy and water.

He and his colleagues have calculated the direction the sand dunes of Nebraska would take if wind directions changed a bit. I thought it was interesting that winds blowing north to south, or vice versa, are warmer than winds blowing east to west or the reverse. Most of the Nebraska area of sand supports a few inches of grass and doesn't reveal the thousands of tons of sand below or the precarious situation of that little bit of topsoil. He had praise for an organization known as the "Sandhills Taskforce," a group of volunteers trying to maintain a healthy system of farms and ranches that rely on grassy terrain for optimal grazing.
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