Note4Students
From UPSC perspective, the following things are important :
Prelims level: Keeling Curve
Why in the News?
Atmospheric CO₂ levels hit a record high in 2024 due to wildfires and human activities, as shown by the Keeling Curve, a 67-year record maintained at Mauna Loa Observatory since 1958.
What is Keeling Curve?
- The Keeling Curve is a long-term record of atmospheric CO₂ concentrations, initiated by Charles David Keeling in 1958 at the Mauna Loa Observatory, Hawaii.
- It tracks the rise in CO₂ levels and provides evidence of the impact of human activities on climate change.
- Named after Charles David Keeling, it has become a globally recognized tool for understanding global warming.
Significant Features and Sources:
- Steady Upward Trend: Demonstrates a consistent rise in atmospheric CO₂ levels since 1958, primarily due to fossil fuel combustion and deforestation.
- Seasonal Fluctuations:
- CO₂ levels decrease during spring and summer as plants absorb CO₂ through photosynthesis.
- Levels increase during fall and winter when plant decay releases CO₂.
- Initial Measurements: Recorded CO₂ levels at 315 ppm in 1958.
- Current Levels: As of January 2025, CO₂ concentrations have reached 427.1 ppm, the highest in millions of years.
- Data Sources: Measurements are taken from Mauna Loa Observatory and other global monitoring stations.
Observations around the Curve
- Key Milestones:
- 1988: CO₂ levels reached 350 ppm, drawing global attention to climate change.
- 2023: Levels exceeded 420 ppm, marking a critical point in atmospheric history.
- 2024: Record growth of 3.58 ppm in average annual CO₂ concentrations compared to 2023.
- Contributing Factors:
- El Niño: Surface temperature rise in the Pacific Ocean boosted CO₂ emissions during 2024, exacerbated by wildfires in North and South America.
- Anthropogenic Emissions: Burning fossil fuels and land-use changes remain major contributors.
- Global Implications:
- Contradicts IPCC scenarios for limiting global warming to 1.5°C, as emissions continue to rise.
- Record increases in CO₂ levels during El Niño events highlight the interplay between natural phenomena and human activities.
PYQ:[2011] Consider the following: 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth? (a) 1 and 4 only (b) 2 and 3 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 |
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