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The Carbon Cycle01:14

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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.
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
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Area of Science:

  • Environmental Science
  • Energy Policy
  • Transportation Engineering

Background:

  • Transportation sector accounts for 28% of U.S. greenhouse gas (GHG) emissions.
  • Decarbonizing transportation is critical for meeting climate goals.

Purpose of the Study:

  • To explore pathways for significant greenhouse gas (GHG) reductions in the U.S. transportation sector by 2050.
  • To analyze the impact of various scenarios including technology, policy, and travel behavior on emission reduction.

Main Methods:

  • Utilized the National Renewable Energy Laboratory's (NREL) Transportation Energy & Mobility Pathways (TEMPO) model.
  • Simulated diverse scenarios with bounding assumptions on future travel, technology, and policy.

Main Results:

  • Multiple pathways can achieve 80% or more well-to-wheel GHG reductions by 2050.
  • Zero-emission vehicle (ZEV) sales must rapidly increase, reaching 100% for light-duty and freight by 2040 in median scenarios.
  • Significant electricity (up to 3,000 TWh) and sustainable biofuel (10-42 billion gallons for aviation) will be required.

Conclusions:

  • Deep decarbonization of transportation is achievable through aggressive ZEV deployment and grid electrification.
  • Sustainable biofuels are essential for hard-to-abate sectors like aviation and for the existing vehicle fleet.
  • Managing travel demand growth is a key strategy to reduce overall energy needs and facilitate the transition.