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Related Concept Videos

Global Climate Change01:50

Global Climate Change

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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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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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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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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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Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Carbon Dioxide Transport in the Blood01:19

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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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The Nitrogen Cycle01:49

The Nitrogen Cycle

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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
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Monitoring global carbon emissions in 2022.

Zhu Liu1, Zhu Deng2, Steve Davis3

  • 1Department of Earth System Science, Tsinghua University, Beijing, China.

Nature Reviews. Earth & Environment
|April 17, 2023
PubMed
Summary
This summary is machine-generated.

Global carbon dioxide (CO2) emissions rose 1.5% in 2022, consuming a significant portion of the remaining carbon budget. At this rate, the budget to limit warming to 1.5°C could be depleted within 2-7 years.

Keywords:
Climate-change impactsClimate-change mitigation

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Area of Science:

  • Climate Science
  • Environmental Science
  • Atmospheric Chemistry

Background:

  • Global carbon dioxide (CO2) emissions are a primary driver of climate change.
  • Understanding emission trends is crucial for climate change mitigation strategies.
  • The remaining carbon budget for limiting global warming to 1.5°C is a critical metric.

Purpose of the Study:

  • To quantify global CO2 emissions for 2022.
  • To assess the impact of 2022 emissions on the remaining carbon budget for 1.5°C warming.
  • To estimate the timeframe for potential depletion of the 1.5°C carbon budget.

Main Methods:

  • Analysis of global CO2 emission data for 2022.
  • Calculation of the percentage of the remaining carbon budget consumed by 2022 emissions.
  • Probabilistic estimation of carbon budget depletion timeframe.

Main Results:

  • Global CO2 emissions reached 36.1 GtCO2 in 2022, a 1.5% increase from 2021.
  • 2022 emissions accounted for 13%-36% of the remaining carbon budget for 1.5°C warming.
  • There is a 67% likelihood that the 1.5°C carbon budget will be depleted within 2-7 years.

Conclusions:

  • Continued increases in global CO2 emissions jeopardize climate change mitigation goals.
  • Urgent and substantial emission reductions are necessary to stay within the 1.5°C carbon budget.
  • The findings highlight the critical need for immediate climate action to avoid exceeding critical warming thresholds.