Something you might have missed amid all the horserace and app-failure coverage of the Iowa caucuses: a deep discussion took place over the past year about the climate crisis and agriculture that could change the way our food system operates. Every leading Democratic campaign now endorses an aggressive approach to conservation that could dramatically reduce greenhouse gases, improve water quality and enhance rural prosperity.

Mark Kastel, a passionate organic farming watchdog, lays out the crisis that is chipping away at the moral high ground occupied by organic food. Consumers pay a premium price for federally certified organic farm goods, he says, not just for the selfish reason of protecting their own health from chemical additives, but also because “they believe they’re doing something good for society.”

As the number of massive livestock farms balloons in states like Iowa, Maryland, and Nebraska, communities are scrambling to figure out how to control the pollution and waste produced by thousands — or tens of thousands — of animals. In some places, officials have opted to ban the mega-farms altogether, and the idea of a moratorium on the biggest animal farms is gaining support in local governments, statehouses, and even in Congress.

On what would have been Leon Statz’s 59th birthday, two dozen plaid-shirted farmers sat in the basement of St. Peter’s Lutheran Church to talk about how they were coping with the forces conspiring against them — the forces that had pushed their neighbor, a third-generation dairyman, to kill himself.