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Related Concept Videos

The Carbon Cycle01:14

The Carbon Cycle

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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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Global Climate Change01:50

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Carbon-dioxide Fixation01:28

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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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Sustainable Development01:43

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As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
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The Calvin Benson Cycle01:46

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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Efficiency of The Carnot Cycle01:16

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The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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Updated: Oct 5, 2025

Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
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The Chinese Carbon-Neutral Goal: Challenges and Prospects.

Ning Zeng1,2, Kejun Jiang3, Pengfei Han4,2

  • 1Department of Atmospheric and Oceanic Science, and Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland 20742 USA.

Advances in Atmospheric Sciences
|January 31, 2022
PubMed
Summary
This summary is machine-generated.

China aims for carbon neutrality by 2060, but decarbonization pathways are challenging. Solar energy plays a critical role, while gradual transitions may not meet IPCC 1.5°C targets.

Keywords:
carbon dioxide reductionscarbon neutraldistributed energy systemenergy system transformationmodel projections

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Area of Science:

  • Environmental Science
  • Energy Policy
  • Climate Change

Background:

  • China announced ambitious climate goals: peak carbon emissions before 2030 and carbon neutrality by 2060.
  • Achieving these goals requires a profound energy transition, presenting significant global and domestic challenges.
  • The pathway to decarbonization remains unclear, necessitating detailed scenario analysis.

Purpose of the Study:

  • To analyze different scenarios for China's decarbonization pathway.
  • To assess the contribution of non-fossil fuel energy sources in achieving carbon neutrality.
  • To evaluate the implications of near-term policies on long-term climate goals.

Main Methods:

  • Analysis of four representative scenarios for China's energy transition.
  • Evaluation of the potential and limitations of various non-fossil fuel energy sources (nuclear, wind, bioenergy, solar).
  • Comparison of different policy transition timings and their impact on cumulative emissions.

Main Results:

  • Significant differences exist across scenarios in achieving carbon neutrality, particularly regarding non-fossil fuel energy contributions.
  • Nuclear, wind, and bioenergy face resource limitations, highlighting solar energy's crucial role.
  • Gradual near-term policies, followed by drastic post-2030 changes, can achieve neutrality but may not align with the IPCC 1.5°C scenario.

Conclusions:

  • China's carbon neutrality goal necessitates a major energy transformation with substantial challenges.
  • Solar energy is identified as a key component for successful decarbonization.
  • Policy choices significantly impact the effectiveness of achieving climate targets, underscoring the need for strategic planning aligned with global climate objectives.