Farm fields don't just feed us. They store carbon. But a big question is how much

DYSART, Iowa (AP) — When Al Schafbuch cut back on plowing his Iowa fields decades ago and later began growing cover crops, he was out to save money on fertilizer and reduce erosion. He got those benefits and saw his soil change for the better, too: dark, chunky, richly organic matter that he said feels like “chocolate cake." There's one more big payoff that benefits everyone: tilling the soil less, and growing more cover crops, can help farmers store more planet-warming carbon in fields. More plants take in more carbon...