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Posts tagged: Conservation

Innovation is Driving Down Greenhouse Gas Emissions from Corn-based Ethanol

A flexible fuel pump with ethanol

This flexible fuel pump offers 30% and 85% ethanol fuel.

Ethanol, primarily derived from corn, supplies about 10 percent of US motor fuel needs.  A new study from ICF which was released today, titled “A Life-Cycle Analysis of the Greenhouse Gas Emissions of Corn-Based Ethanol,” finds that greenhouse gas (GHG) emissions associated with corn-based ethanol in the United States are about 43 percent lower than gasoline when measured on an energy equivalent basis.  This is comparable to reducing GHG emissions in the U.S. transportation sector by as much as 35.5 million metric tons per year.

Ethanol production has changed significantly over the past ten years. U.S. production has ramped up from 3.9 to 14.8 billion gallons per year between 2005 and 2015. As demand for corn ethanol has increased, corn production in the US expanded from 11.8 billion bushels in 2004 to 13.6 billion bushels in 2015 (NASS).

Unlike earlier studies of ethanol’s GHG benefits, which had to rely on projections of future ethanol production systems and expected impacts on the farm sector, this study was able to review how the industry and farm sectors have performed over the past decade to assess the current GHG profile of corn-based ethanol.

Earlier studies of ethanol’s GHG balance projected the effects of allocating billions of bushels of corn to ethanol production on supplies of corn and other commodities going to domestic and world food and feed markets.  Those studies expected that farmers in the U.S. and other regions would respond to higher corn prices by bringing new lands into corn production. Bringing new land into commodity production typically results in increased GHG emissions—and those emissions can be large if the former land use was native grassland, wetland, or forest. However, what actually occurred in the US and around the world is more complex.

The Three Rivers Energy biorefinery in Ohio

The Three Rivers Energy biorefinery in Ohio produces corn-based ethanol.

Increased use of corn to produce ethanol in the US did have a positive price effect on corn.  As a result, within the US and abroad, idled croplands were brought into production; cropland already in production was managed more intensively; and by-products of corn ethanol production were used more efficiently as animal feed. Around the world, producers increased their use of double cropping.

The ICF report draws on those new data, including the analysis in Bruce Babcock and Zabid Iqbal’s publication “Using Recent Land Use Changes to Validate Land Use Change Models”.  Babcock and Iqbal’s study confirmed that the primary land-use change response by the world’s farmers to increased demand for corn during the period 2004-2012 was to increase double cropping, reduce un-harvested planted area, reduce fallow land, and reduce temporary pasture in order to expand production. Moreover, the use of distillers dried grains and solubles (or DDGS) became a preferred substitute for corn grain, thereby muting the increased demand.

Those types of production gains are emblematic of innovation in modern agriculture. In 1961, it took 3.38 billion acres of cropland to feed the world’s population of 3.5 billion people. Over the next fifty years, the world’s population doubled to seven billion people, while cultivated land increased by only 12 percent to 3.78 billion acres. Productivity gains driven by improvements in technology have allowed farmers to get more output from existing resources, and thereby to keep pace with the growing demands an increasing global population puts on agriculture for food, fiber, and energy products.

In addition to the gains from reduced levels of land conversion, the ICF report shows that the reductions in GHG emissions from corn ethanol are continually driven by a variety of improvements in efficiency, from the corn field to the ethanol refinery. On-farm conservation practices, such as reduced tillage and nitrogen management, improved the GHG balance of growing corn for ethanol. Production yields, measured in gallons of ethanol per bushel of corn, have increased by 3.4 percent between 2006 and 2014.

Ethanol plants have also improved process efficiencies and can now produce biofuels that generate double the lifecycle GHG reductions estimated earlier, and there are opportunities to improve performance even more. New enzymes and yeast strains have increased process efficiencies in starch conversion and fermentation. Those process upgrades have become drivers for a decreasing GHG-intensity of corn ethanol production. Improved technologies such as combined heat and power, and using landfill gas for energy offer continued areas for improved efficiencies.  New co-products, such as corn-oil biodiesel and DDGS have helped reduce GHG lifecycle emissions.

The report concludes that the GHG profile of corn ethanol is on track to be almost 50 percent lower than gasoline in 2022 if current trends in corn yields, process fuel switching, and improvements in trucking fuel efficiency continue.

One of the ICF report’s important findings is that there is a large potential for additional gains in ethanol’s GHG efficiency. The study examined the potential GHG benefits of additional on-farm conservation practices and efficiency improvements, such as the practices outlined in USDA’s Building Blocks for Climate Smart Agriculture and Forestry strategy. When these practices and plant efficiency improvements are universally adopted, the GHG benefits of corn ethanol are even more pronounced over gasoline—potentially rising to 76 percent gain in GHG benefits.

Continuing these trends is good news for the transportation sector—and the agriculture sector—when it comes to reducing GHG emissions.

A nearly 100 percent biodegradable kitty litter made from dried distiller’s grains, left over from corn-ethanol production

USDA scientists have developed a nearly 100 percent biodegradable kitty litter made from dried distiller’s grains, left over from corn-ethanol production.

Here’s a New Year’s Resolution that You’ll Want to Keep

A composite of farm field days participants

Farm field days show participants the most innovative farming methods.

The New Year is here and most of us are making resolutions about how to improve our lives in 2017. Well, we at the Natural Resources Conservation Service believe that learning about farming and conserving natural resources should be at the top of everyone’s list of resolutions. How can you make that happen? By signing up for a farm field day. Field days will give you plenty of opportunities to learn about how good agriculture is done and boost your knowledge of how to conserve and protect natural resources.

If you’re fortunate enough to be in or near Wisconsin, be sure to visit the Lower Fox River Watershed. It’s just south of Green Bay and home to the Great Lakes Demonstration Farm Network where you can see leading-edge conservation practices that are specifically designed to help farmers reduce how much phosphorus enters Green Bay and improve water quality in the Great Lakes. Read more »

Resolve to Build Healthy Soils on Rented Land

Five questions.

Five questions.

Do you rent out your land for agriculture? If you do, don’t forget about your farm when you’re making your New Year’s resolutions. Here are five questions from USDA’s Natural Resources Conservation Service (NRCS) that you need to ask the folks who rent your land: Do you build organic matter in the soil? Do you test the soil at least once every four years? Do you use no-till practices? Do you use cover crops? What can we do together to improve soil health on your land?

If you’re lucky, you have a renter like John Z. Beiler who rented acres of prime farmland in Port Royal, Pennsylvania. At the landowner’s encouragement John worked with NRCS to address gully erosion, test the farm’s soils, control noxious weeds and comply with highly erodible land and conservation plan requirements. Read more »

Bringing Back Diversity in Eastern Forests for Landowners, Wildlife

Cerulean warblers spend part of the year in the Appalachian Mountains of North America as well as the Andes Mountains of South America. Photo by DJ McNeil.

Cerulean warblers spend part of the year in the Appalachian Mountains of North America as well as the Andes Mountains of South America. Photo by DJ McNeil.

What do biologists look for in a healthy forest? A diversity in the ages and composition of trees and occasional breaks in canopy to allow sunlight to reach understory plants. Healthy forests, just like healthy human populations, are sustained by a diversity of ages. Each group has a role to play in maintaining the whole community over the long term.

But healthy, diverse forests are on the decline across the eastern United States. A lack of natural and human-induced disturbances because of fire suppression and certain timber harvest methods have led the forested landscape to become largely homogenous. Read more »

Climate Smart Conservation Partnership Serves Two Scoops of On-Farm Solutions

Ben & Jerry’s and their dairy partners

Ben & Jerry’s and its dairy partners will use the information generated by COMET to identify on-farm conservation actions—such as approaches to manure management and soil health management practices—that can help reduce greenhouse gas emissions and sequester carbon. Photo: Kari Cohen, NRCS.

Eating a pint of Ben & Jerry’s ice cream may make you feel guilty about your waistline, but thanks to a new partnership between the ice cream company and USDA’s Natural Resources Conservation Service (NRCS), you may be able to feel less guilty about contributing to climate change. The partnership is designed to help Ben & Jerry’s milk suppliers—generally small dairies—understand their greenhouse gas footprint and consider voluntary conservation approaches to reduce that footprint.

NRCS and Ben & Jerry’s will help dairies implement conservation practices that meet Ben & Jerry’s objective of “Happy Cows, Happy Planet, & Happy Farmers.” Through its Caring Dairy sustainability program, Ben & Jerry’s will use USDA’s suite of greenhouse gas estimation tools, COMET-FarmTM and COMET-PlannerTM, to quantify on-farm GHG emissions and reductions. The COMET tools—COMET stands for CarbOn Management & Emissions Tool – are a product of a long-standing partnership between NRCS and Colorado State University. Read more »

Seeing is Believing: Soil Health Practices and No-Till Farming Transform Landscapes and Produce Nutritious Food

Before image of Wasco County

Beginning in 1935, the agency helped countless farmers in the region install structures that would reduce soil erosion and prevent sediment from leaving crop fields. Photo: NRCS.

This month, we’re highlighting 12 important gifts given to us when we conserve natural resources: soil, food, plants, wildlife, people, health, protection, recreation, air, water, technology and the future. NRCS’ mission is to conserve the full range of natural resources, but soil health is our foundation. And it’s the first conservation gift that we’re going to highlight. And without soil, we couldn’t celebrate with food. We encourage you to give the gift of conservation this season!

Curbing Soil Erosion

Soil is the foundation for a healthy environment. If you need proof that no-till farming works, look no further than the rolling hills of north-central Oregon.

For decades, this region was dominated by winter wheat farms that used extensive tillage to control weeds during fallow years. It was the conventional way of farming in the area, from the early 1900’s through the 1980’s. Read more »