Skip to main content

Human Climate Impacts

Human influence on the global climate system has intensified dramatically since the Industrial Revolution (around 1750). With the rapid expansion of industry, fossil fuel consumption, and large-scale land-use change, human activities have altered the Earth's energy balance, atmospheric composition, and natural climate processes. In environmental science and climatology, this process is described using key concepts such as anthropogenic climate change, greenhouse gas emissions, radiative forcing, and the Anthropocene.

Today, more than half of all industrial carbon dioxide (CO₂) emissions have occurred since 1970, highlighting the rapid acceleration of human impact. These emissions, primarily from fossil fuel combustion, deforestation, and industrial agriculture, have increased global average temperatures by approximately 1.1–1.2°C since the pre-industrial period (1850–1900). The period 2015–2024 is recorded as the warmest decade in modern climate observations

1. Industrial Revolution (~1750)

Key Concept: Anthropogenic Greenhouse Gas Emissions

The Industrial Revolution marked the transition from traditional energy sources to fossil fuels such as coal, oil, and natural gas. Industrialization significantly increased atmospheric concentrations of greenhouse gases.

Environmental Significance

  • Rapid expansion of factories and mechanized production.

  • Increased combustion of fossil fuels, releasing carbon dioxide and other pollutants.

  • Large-scale deforestation for industrial expansion and agriculture.

Key Terminologies

  • Fossil Fuels: Energy sources formed from ancient organic matter (coal, oil, natural gas).

  • Anthropogenic Emissions: Greenhouse gases released due to human activities.

  • Radiative Forcing: Change in Earth's energy balance caused by greenhouse gases.

This period marks the beginning of significant human influence on the climate system.

2. Discovery of the Greenhouse Effect (1824)

Scientist: Joseph Fourier

Joseph Fourier first proposed the greenhouse effect, explaining how Earth's atmosphere traps heat and keeps the planet warmer than it would otherwise be.

Key Concept

  • Certain atmospheric gases absorb and re-emit heat, preventing it from escaping into space.

Terminology

  • Greenhouse Effect: Natural warming process where gases such as CO₂, methane, and water vapor trap outgoing infrared radiation.

This concept forms the foundation of modern climate science.

3. Carbon Dioxide as a Greenhouse Gas (1856)

Scientist: Eunice Newton Foote

Foote experimentally demonstrated that carbon dioxide (CO₂) strongly absorbs heat, suggesting that higher atmospheric concentrations could warm the planet.

Terminology

  • Carbon Dioxide (CO₂): A major greenhouse gas produced from fossil fuel burning, deforestation, and respiration.

Her work was one of the earliest scientific recognitions of human-induced climate warming.

4. First Climate Model Prediction (1896)

Scientist: Svante Arrhenius

Arrhenius developed the first quantitative climate model, calculating that increased atmospheric CO₂ could significantly raise global temperatures.

Key Concept

  • Doubling atmospheric CO₂ could lead to measurable global warming.

Terminology

  • Climate Sensitivity: The temperature increase resulting from a doubling of CO₂ concentrations.

This was the first theoretical prediction of anthropogenic climate change.

5. Keeling Curve (1958)

Scientist: Charles David Keeling

Keeling began continuous measurements of atmospheric CO₂ concentrations at Mauna Loa Observatory in Hawaii.

Key Significance

  • Produced the famous Keeling Curve, showing a steady annual rise in atmospheric CO₂.

Terminology

  • Keeling Curve: Long-term record of atmospheric CO₂ concentration showing increasing levels due to human activities.

This provided direct empirical evidence of rising greenhouse gas levels.

6. Environmental Movement (1960s–1970s)

Growing scientific awareness of pollution and environmental degradation led to the rise of the modern environmental movement.

Major Developments

  • Establishment of environmental laws such as the Clean Air Act and Clean Water Act in several countries.

  • Creation of environmental agencies and regulatory frameworks.

Key Terminology

  • Environmental Governance: Policies and institutions designed to manage environmental resources sustainably.

7. Establishment of the IPCC (1988)

The Intergovernmental Panel on Climate Change (IPCC) was established by the United Nations and the World Meteorological Organization.

Purpose

  • To assess scientific research related to climate change, impacts, and mitigation strategies.

Terminology

  • Climate Assessment Reports: Periodic scientific reports evaluating global climate data and projections.

IPCC reports provide the global scientific consensus on climate change.

8. Kyoto Protocol (1997)

The Kyoto Protocol was the first international agreement to legally limit greenhouse gas emissions.

Key Features

  • Binding emission reduction targets for developed countries.

  • Mechanisms such as carbon trading and clean development mechanisms (CDM).

Terminology

  • Carbon Market: System where emission reductions can be traded between countries.

9. Paris Agreement (2015)

The Paris Agreement represents a major global commitment to limit climate change.

Main Objective

  • Limit global warming to well below 2°C above pre-industrial levels, ideally 1.5°C.

Terminology

  • Nationally Determined Contributions (NDCs): Climate action plans submitted by individual countries.

10. Recent Climate Warnings (2021–2024)

Recent IPCC reports confirm that global warming is accelerating faster than previously projected.

Key Findings

  • Global temperatures may exceed 1.5°C above pre-industrial levels by the early 2030s.

  • Increasing frequency of extreme climate events such as heatwaves, floods, and droughts.

Key Indicators of Global Environmental Change 

(1880–Present)

1. Sea Level Rise

Global sea levels have risen about 21–24 cm (8–9 inches) since 1880.

Causes

  • Thermal expansion of seawater as oceans warm.

  • Melting glaciers and ice sheets in Greenland and Antarctica.

Terminology

  • Thermal Expansion: Increase in water volume due to temperature rise.

2. Arctic Sea Ice Decline

Satellite observations since 1979 show a continuous decrease in Arctic sea ice.

Key Trend

  • Arctic ice is shrinking by an area roughly the size of South Carolina every year.

Terminology

  • Cryosphere: Frozen components of the Earth system, including glaciers and sea ice.

3. Biodiversity Crisis

Human activities have triggered a global biodiversity crisis.

Key Statistics

  • Approximately 1 million plant and animal species are threatened with extinction.

Terminology

  • Sixth Mass Extinction: Current large-scale loss of species driven by human activities.

Major Drivers

1. Fossil Fuel Combustion

Burning coal, oil, and natural gas produces carbon dioxide, the largest contributor to global warming.

2. Deforestation

Forest removal reduces carbon sequestration, increasing atmospheric CO₂.

3. Industrial Agriculture

Agriculture emits methane (CH₄) from livestock and nitrous oxide (N₂O) from fertilizers.


Comments

Post a Comment

Popular posts from this blog

Accuracy Assessment

Accuracy assessment is the process of checking how correct your classified satellite image is . 👉 After supervised classification, the satellite image is divided into classes like: Water Forest Agriculture Built-up land Barren land But classification is done using computer algorithms, so some areas may be wrongly classified . 👉 Accuracy assessment helps to answer this question: ✔ "How much of my classified map is correct compared to real ground conditions?"  Goal The main goal is to: Measure reliability of classified maps Identify classification errors Improve classification results Provide scientific validity to research 👉 Without accuracy assessment, a classified map is not considered scientifically reliable . Reference Data (Ground Truth Data) Reference data is real-world information used to check classification accuracy. It can be collected from: ✔ Field survey using GPS ✔ High-resolution satellite images (Google Earth etc.) ✔ Existing maps or survey reports 🧭 Exampl...
Post a Comment
Read more

REMOTE SENSING INDICES

Remote sensing indices are band ratios designed to highlight specific surface features (vegetation, soil, water, urban areas, snow, burned areas, etc.) using the spectral reflectance properties of the Earth's surface. They improve classification accuracy and environmental monitoring. 1. Vegetation Indices NDVI – Normalized Difference Vegetation Index Formula: (NIR – RED) / (NIR + RED) Concept: Vegetation reflects strongly in NIR and absorbs in RED due to chlorophyll. Measures: Vegetation greenness & health Uses: Agriculture, drought monitoring, biomass estimation EVI – Enhanced Vegetation Index Formula: G × (NIR – RED) / (NIR + C1×RED – C2×BLUE + L) Concept: Corrects for soil and atmospheric noise. Measures: Vegetation vigor in dense canopies Uses: Tropical rainforest mapping, high biomass regions GNDVI – Green Normalized Difference Vegetation Index Formula: (NIR – GREEN) / (NIR + GREEN) Concept: Uses Green instead of Red ...
Post a Comment
Read more

Landsat 8 Band designation and Band Combination.

Landsat 8 Band designation and Band Combination.  Landsat 8-9 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) Bands Wavelength (micrometers) Resolution (meters) Band 1 - Coastal aerosol 0.43-0.45 30 Band 2 - Blue 0.45-0.51 30 Band 3 - Green 0.53-0.59 30 Band 4 - Red 0.64-0.67 30 Band 5 - Near Infrared (NIR) 0.85-0.88 30 Band 6 - SWIR 1 1.57-1.65 30 Band 7 - SWIR 2 2.11-2.29 30 Band 8 - Panchromatic 0.50-0.68 15 Band 9 - Cirrus 1.36-1.38 30 Band 10 - Thermal Infrared (TIRS) 1 10.6-11.19 100 Band 11 - Thermal Infrared (TIRS) 2 11.50-12.51 100 Vineesh V Assistant Professor of Geography, Directorate of Education, Government of Kerala. https://www.facebook.com/Applied.Geography http://geogisgeo.blogspot.com
1 comment
Read more

Energy Interaction with Atmosphere and Earth Surface

In Remote Sensing , satellites record electromagnetic radiation (EMR) that is reflected or emitted from the Earth. Before reaching the sensor, radiation interacts with: The Atmosphere The Earth's Surface These interactions control how satellite images look and how we interpret them. I. Interaction of EMR with the Atmosphere When solar radiation travels from the Sun to the Earth, four main processes occur: 1. Absorption Definition: Absorption occurs when atmospheric gases absorb radiation at specific wavelengths and convert it into heat. Main absorbing gases: Ozone (O₃) → absorbs Ultraviolet (UV) Carbon dioxide (CO₂) → absorbs Thermal Infrared Water vapour (H₂O) → absorbs Infrared Concept: Atmospheric Windows These are wavelength regions where absorption is very low, allowing radiation to pass through the atmosphere. Remote sensing depends on these windows. For example, satellites like Landsat 8 use visible, near-infrared, and thermal bands located in atmospheric windows. 2. Trans...
Post a Comment
Read more

Change Detection

Change detection is the process of finding differences on the Earth's surface over time by comparing satellite images of the same area taken on different dates . After supervised classification , two classified maps (e.g., Year-1 and Year-2) are compared to identify land use / land cover changes .  Goal To detect where , what , and how much change has occurred To monitor urban growth, deforestation, floods, agriculture, etc.  Basic Concept Forest → Forest = No change Forest → Urban = Change detected Key Terminologies Multi-temporal images : Images of the same area at different times Post-classification comparison : Comparing two classified maps Change matrix : Table showing class-to-class change Change / No-change : Whether land cover remains same or different Main Methods Post-classification comparison – Most common and easy Image differencing – Subtract pixel values Image ratioing – Divide pixel values Deep learning methods – Advanced AI-based detection Examples Agricult...
Post a Comment
Read more