6. In spite of breathing out carbon dioxide in a large amount and released by combsuion, the atmosphere has mere fraction of CO2 only. Why?

Understanding the Discrepancy in Atmospheric CO2 Levels

Introduction: The presence of carbon dioxide (CO2) in the atmosphere is influenced by various natural and human-driven factors. Despite significant CO2 emissions from combustion processes, the atmosphere maintains a relatively low concentration of this greenhouse gas. Understanding the reasons behind this apparent contradiction is crucial for comprehending climate dynamics.

Factors Influencing Atmospheric CO2 Levels:

1. Natural Carbon Cycle:

   • Earth's carbon cycle involves various processes such as photosynthesis, respiration, and carbon exchange between the atmosphere, oceans, and land.
   • Plants absorb CO2 during photosynthesis, converting it into organic matter, which is then utilized by animals through respiration. This cyclic process helps maintain a balance in atmospheric CO2 levels.

2. Carbon Sinks:

   • Oceans and forests act as carbon sinks, absorbing CO2 from the atmosphere.
   • Oceanic absorption occurs through physical and chemical processes, such as dissolution and biological uptake by marine organisms.
   • Forests, through photosynthesis, sequester CO2 in biomass and soil, mitigating its concentration in the atmosphere.

3. Carbon Sequestration:

   • Natural geological processes, such as mineralization and sedimentation, store carbon over long periods.
   • Human interventions, such as afforestation, reforestation, and carbon capture and storage (CCS) technologies, enhance carbon sequestration capacity.

Human Impact on Atmospheric CO2:

1. Fossil Fuel Combustion:

   • Burning fossil fuels releases CO2 into the atmosphere, contributing significantly to anthropogenic emissions.
   • Activities like transportation, industrial processes, and energy production are major sources of CO2 emissions.

2. Deforestation:

   • Deforestation reduces the capacity of forests to sequester carbon, leading to the release of stored CO2 into the atmosphere.
   • Conversion of forested land for agriculture, urbanization, and infrastructure development exacerbates this effect.

Explanation of the Discrepancy:

1. Natural Carbon Cycling:

   • The Earth's natural carbon cycle, driven by biological and geological processes, helps regulate atmospheric CO2 levels by continuously exchanging carbon between various reservoirs.
   • Despite human-induced emissions, natural processes act as counterbalances, mitigating the impact on atmospheric CO2 concentrations.

2. Carbon Sinks and Sequestration:

   • The presence of significant carbon sinks, such as oceans and forests, absorbs a considerable portion of emitted CO2, preventing it from accumulating in the atmosphere.
   • Additionally, efforts to enhance carbon sequestration through reforestation and other measures contribute to offsetting CO2 emissions.

Conclusion: The apparent paradox of significant CO2 emissions from combustion processes coexisting with relatively low atmospheric concentrations can be explained by the intricate interplay of natural carbon cycling, carbon sinks, and human interventions. While human activities contribute to rising CO2 levels, the Earth's natural systems possess inherent mechanisms to mitigate the impact, underscoring the importance of understanding and managing these processes for climate stability.

This comprehensive explanation elucidates the complex dynamics governing atmospheric CO2 levels, offering insights into the role of both natural and human-driven factors in shaping our planet's climate.