US cropland has declined over the last ten years. It was steady from 1998 to 2014, but the farmland acreage is decreasing. See the farmdoc daily blog for the details. What is especially scary is that the economists who have looked at the data do not have a good explanation for this fall. We should be especially concerned because if there are no increases in productivity, we will be in a food deficit. Of course, Latin America has been a large marginal producer, and there is no current problem, but the risk of a food shortfall will increase if there is less land for farming. This is an issue worth keeping on the radar screen.
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