In December, 1996, the Center for Global and Regional Environmental Research (CGRER) at the University of Iowa published the Iowa Greenhouse Gas Action Plan, a report prepared in cooperation with the Iowa Department of Natural Resources. The report included 16 recommendations for priority reductions in greenhouse gas emissions to prevent global warming and to improve the economy of the State. Recommendations included: energy efficiency, wind power development, reduction in fertilizer applications, capturing of methane at large hog lots, production of energy crops (switchgrass and poplars), market incentives, and carbon sequestration in forests, buffer strips, and prairies. Progress has been made on wind power development, switchgrass production, and some of the energy efficiency recommendations since 1996. However, the State has continued to use more energy and to emit more greenhouse gases each year. We are currently emitting about 100 million tons of carbon dioxide equivalents each year (100 million short tons CO2-eq/yr). That is an average of 35 tons of carbon dioxide into the atmosphere per year from each Iowa citizen, considering all our activities (industrial, commercial, residential, and transportation). It is the purpose of this report to provide quantification and demonstration of agricultural recommendations in the Iowa Greenhouse Gas Action Plan, i.e., carbon storage in forests (aboveground sequestration) and soils (below-ground sequestration), and energy crop utilization. These actions remain some of the most cost-effective means to reduce greenhouse gas emissions in the State of Iowa, together with energy efficiency.