Biofuel production from grains presents several potential environmental risks, including land use changes, the release of greenhouse gasses, and impacts on biodiversity. While biofuels are considered carbon neutral in principle, the industrial production of agricultural biofuels can result in additional emissions of greenhouse gasses that may offset the benefits of using a renewable fuel. The use of regular feedstock, such as corn and soybeans, as a primary component of first-generation biofuels has also sparked the “food versus fuel” debate.
What are the environmental impacts of using grains for biofuel production?
How does biofuel production affect land use and biodiversity?
The emphasis on ethanol derived from corn is shifting grasslands and brushlands to corn monocultures, impacting biodiversity. Energy crops grown for biofuel can compete for the world’s natural habitats. For example, emphasis on biodiesel is bringing down ancient tropical forests to make way for oil palm plantations. Loss of natural habitat can change the hydrology, increase erosion, and generally reduce biodiversity of wildlife areas.
What are the greenhouse gas emissions associated with grain-based biofuels?
In practice, the industrial production of agricultural biofuels can result in additional emissions of greenhouse gases that may offset the benefits of using a renewable fuel. These emissions include carbon dioxide from the burning of fossil fuels during the production process and nitrous oxide from soil that has been treated with nitrogen fertilizer. In this regard, cellulosic biomass is considered to be more beneficial.
How does biofuel production from corn compare to other sources?
Ethanol made from corn represents a relatively small energy gain. The energy gain from sugarcane is greater, and that from cellulosic ethanol or algae biodiesel could be even greater. Some of the disadvantages of biofuels apply mainly to low-diversity biofuel sources—corn, soybeans, sugarcane, oil palms—which are traditional agricultural crops.
What is the "food versus fuel" debate?
In diverting arable land and feedstock from the human food chain, biofuel production can affect the economics of food price and availability. Corn-based biofuels were initially touted as environmentally friendly alternatives to petroleum, but their production diverts arable land and feedstock from the human food chain, sparking a “food versus fuel” debate.
Can biofuel production be sustainable?
One alternative involves the use of highly diverse mixtures of species, with the North American tallgrass prairie as a specific example. Converting degraded agricultural land that is out of production to such high-diversity biofuel sources could increase wildlife area, reduce erosion, cleanse waterborne pollutants, store carbon dioxide from the air as carbon compounds in the soil, and ultimately restore fertility to degraded lands.
One distinctive promise of biofuels is that, in combination with an emerging technology called carbon capture and storage, the process of producing and using biofuels may be capable of perpetually removing carbon dioxide from the atmosphere.
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