This week, we're exploring the technological, environmental and economic challenges of feeding the human race. Desiree Schell spends the hour with Valentine Cadieux, professor of Sociology and Geology at the University of Minnesota, and graduate researcher Emily Cassidy. They'll discuss the sustainability of current global food production, and look forward to how those systems can adapt to keep up with an expanding human population. And we'll speak to researcher and blogger Danielle N. Lee, about a recent controversy in the science blogosphere.