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Related Concept Videos

Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
Microbes and Climate Change01:27

Microbes and Climate Change

Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
Bioremediation00:46

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
The Carbon Cycle01:14

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
Microbes and Methanogenesis01:26

Microbes and Methanogenesis

Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...

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Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
11:33

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Published on: September 2, 2016

Indirect emissions from biofuels: how important?

Jerry M Melillo1, John M Reilly, David W Kicklighter

  • 1The Ecosystems Center, Marine Biological Laboratory (MBL), 7 MBL Street, Woods Hole, MA 02543, USA. jmelillo@mbl.edu

Science (New York, N.Y.)
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Expanding global cellulosic bioenergy programs may increase greenhouse gas emissions due to land-use changes. Protecting forests and optimizing nitrogen fertilizer use are key to mitigating these biofuel production emissions.

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Area of Science:

  • Environmental Science
  • Climate Science
  • Agricultural Science

Background:

  • Global biofuels programs face land supply pressures.
  • Land-use changes from biofuels can increase greenhouse gas emissions.

Purpose of the Study:

  • To examine direct and indirect land-use change effects on greenhouse gas emissions from a global cellulosic bioenergy program.
  • To assess the impact over the 21st century.

Main Methods:

  • Utilized linked economic and terrestrial biogeochemistry models.
  • Analyzed potential land-use changes from an expanded global cellulosic bioenergy program.

Main Results:

  • Indirect land use is predicted to cause substantially more carbon loss than direct land use (up to twice as much).
  • Nitrous oxide emissions from increased fertilizer use are projected to be more significant for warming potential than carbon losses.
  • A global policy protecting forests and promoting best practices for nitrogen fertilizer use can significantly reduce biofuel production emissions.

Conclusions:

  • Biofuel expansion necessitates careful land-use management to mitigate climate impact.
  • Policy interventions focusing on forest protection and nitrogen fertilizer management are crucial for sustainable biofuel production.