By adopting practices like planting winter cover crops and reducing—or better yet eliminating—tillage practices, farmers can significantly improve productivity of their fields, reduce soil erosion, improve water quality and increase carbon storage. In fact, agricultural soils are among the planet's largest reservoirs (or sinks) of carbon. Improving soil on American croplands has the potential to mitigate 25 million metric tons of greenhouse gas emissions. That’s the equivalent to taking 5 million passenger cars off the road for one year.