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Related Concept Videos

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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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Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:  
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In statistics, two variables are said to be correlated if the values of one variable are associated with the other variable. Depending on the relationship between two variables, correlation can be of three types– positive correlation, negative correlation, and zero correlation.
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Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Updated: Oct 15, 2025

Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples
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No evidence for global decrease in CO2 concentration during the first wave of COVID-19 pandemic.

YoungSeok Hwang1, Jong Wook Roh1,2, Dongjun Suh1,3

  • 1Department of Climate Change, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu, 41566, South Korea.

Environmental Monitoring and Assessment
|October 27, 2021
PubMed
Summary
This summary is machine-generated.

Global COVID-19 lockdowns did not reduce carbon dioxide (CO2) concentrations. Satellite and ground station data show CO2 levels continued to rise globally, challenging previous assumptions about pandemic impacts on climate change.

Keywords:
COVID-19; Carbon budget; CO2 profileCoronaGOSAT (Greenhouse Gases Observing Satellite)Global Atmosphere Watch (GAW)World Meteorological Organization (WMO)

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Area of Science:

  • Atmospheric Science
  • Climate Change Research
  • Environmental Monitoring

Background:

  • Previous studies suggested COVID-19 lockdowns decreased global CO2 emissions.
  • Estimates were often based on energy consumption or limited local data.
  • Objective evidence on global CO2 concentration changes during the pandemic was lacking.

Purpose of the Study:

  • To investigate claims of decreased global CO2 concentration during the first COVID-19 wave.
  • To provide objective evidence using satellite and ground-based measurements.
  • To inform climate change mitigation policies in the post-COVID-19 era.

Main Methods:

  • Time-series analysis of long-term CO2 concentration data.
  • Comparison of data before and after the first COVID-19 wave (inflection point).
  • Utilized data from World Meteorological Organization Global Atmosphere Watch (WMO GAW) and Greenhouse Gases Observing Satellite (GOSAT).

Main Results:

  • CO2 concentrations in Europe, China, and the USA continuously rose in March-April 2020 compared to 2019.
  • Satellite (GOSAT) and ground station (GAW) data revealed no change in the vertical CO2 profile.
  • Global lockdown measures did not alter atmospheric CO2 levels from the surface to the upper atmosphere.

Conclusions:

  • The global lockdown during the first COVID-19 wave did not significantly impact global CO2 concentrations.
  • Findings challenge previous assumptions and highlight the need for robust data.
  • Results provide a foundation for developing effective climate change mitigation strategies.