Leopold Center Policy Initiative invests in land tenure program ; Leopold Center studies denitrifying bioreactors - possible help for Gulf 'dead zone' ; Director: What changes do you see taking place in how people view agriculture? ; Kirschenmann: The dangers of too much certainty ; Local food, local government: Farm to Fork program a success ; Guest columnist: Livestock and Diversity: Learning from Iowa's past ; Producers extend crop seasons using high tunnel production ; New volume touts eternal value of grassland to agriculture Guest Column: Following Leopold into your own wilderness ; Center's research summaries now available on-line only