Tyler Chalfant | February 4th, 2020
The Iowa Department of Natural Resources is required to issue a report of estimated greenhouse gas emissions each year, and to forecast trends in emissions going forward. At the end of 2019, they released their 2018 report, measuring emissions of carbon dioxide, methane, nitrous oxide, perfluorocarbons, hydrofluorocarbons, and sulfur hexafluorides. Combined, the total gross greenhouse gas emissions in Iowa reached 137.49 million metric tons carbon dioxide equivalent (MMtCO₂e), the highest emissions have been since 2010.
This number has risen 3.38%, or 4.49 MMtCO₂e, from 2017, and 10.09% from 2016, when emissions were at a recent low. The greatest increases came from power plants generating more electricity from fossil fuels, increased fossil fuel emissions from the residential/commercial/industrial sector, an increase in agricultural emissions, and a rise in the production of ammonia in the industrial processes sector.
With 30% of the state’s total, agriculture remains the largest source of gross emissions in Iowa. Power plant emissions have fallen over the past ten years, and have not been the leading source of emissions since 2011. However, like the rest of the state’s emissions, use of coal and natural gas in electric generation has risen since 2016, while generation from wind, nuclear, and hydropower have fallen slightly.
The DNR projects that agricultural and overall emissions will continue to rise over the next ten years. Overall emissions for 2018 exceeded the projection by nearly 7 MMtCO₂e, largely due to the rise in power plant emissions.