Earth Science: The Science Behind The Earth’s Rising Temperature

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Category: Earth, Air, Space Science

Published on Tuesday, 07 October 2025 12:56

Written by Science Editor

Global warming refers to the long-term increase in Earth's average surface temperature due to human activities, primarily the emission of greenhouse gases. Climate change encompasses global warming but also includes other changes which will be discussed in this article.

Climate change also includes catastrophic changes in the earth's elements such as sea level rise, ice mass loss in Greenland, Antarctica, and the Arctic, and changes in the timing of seasonal events.

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The Greenhouse Effect

The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth, some of it is reflected back to space and the rest is absorbed, warming the planet. The Earth then radiates heat in the form of infrared energy. Greenhouse gases such as carbon dioxide (CO₂), methane (CH₄), and water vapor (H₂O) trap some of this infrared energy in the atmosphere, preventing it from escaping into space. This trapped heat warms the Earth.

The Role of Greenhouse Gases

Greenhouse gases are crucial for maintaining the Earth's temperature. Without them, the planet would be too cold to sustain life. However, human activities have increased the concentration of these gases in the atmosphere. For example, burning fossil fuels such as coal, oil, and natural gas releases large amounts of CO₂. Deforestation, industrial processes, and some agricultural practices also contribute to greenhouse gas emissions.

Carbon Dioxide (CO₂)

Carbon dioxide is the primary greenhouse gas emitted through human activities. It is responsible for about 64% of human-caused global warming. The concentration of CO₂ in the atmosphere has increased by more than 40% since the beginning of the industrial revolution due to activities such as burning fossil fuels and deforestation.

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Methane (CH₄)

Methane is another significant greenhouse gas, with a much greater warming potential than CO₂, although it exists in smaller quantities. Methane is released during the production and transport of coal, oil, and natural gas, as well as from livestock and other agricultural practices.

Water Vapor (H₂O)

Water vapor is the most abundant greenhouse gas, but its concentration in the atmosphere is largely controlled by natural processes. However, as the Earth warms, more water evaporates from oceans and lakes, increasing the concentration of water vapor in the atmosphere and further amplifying the greenhouse effect.

Human Activities and Global Warming

The burning of fossil fuels for energy and transportation is the largest source of greenhouse gas emissions from human activities. Coal, oil, and natural gas contain high levels of carbon, and when burned, they release CO₂ into the atmosphere. Additionally, deforestation for agriculture and urban development reduces the number of trees that can absorb CO₂, further increasing atmospheric CO₂ levels.

Industrial Processes

Industrial processes such as cement production and chemical manufacturing also release significant amounts of greenhouse gases. Cement production, in particular, involves the decomposition of calcium carbonate, which releases CO₂.

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Agriculture

Agriculture contributes to global warming through the release of methane from livestock digestion and manure management, as well as nitrous oxide from fertilizer application. Rice paddies also produce methane as a result of anaerobic decomposition.

Waste Management

Waste management practices, such as landfills, produce methane through the decomposition of organic waste. Proper waste management and recycling can help reduce these emissions.

Impacts of Rising Temperatures

The increase in global temperatures has widespread impacts on the environment. These include more frequent and severe heatwaves, altered precipitation patterns leading to droughts and floods, and more intense and frequent storms. The melting of glaciers and ice caps contributes to sea level rise, threatening coastal communities and ecosystems.

Ocean Warming

The oceans absorb about 90% of the excess heat from global warming, leading to increased sea temperatures. This can cause coral bleaching, disrupt marine ecosystems, and amplify the strength of hurricanes and typhoons.

Sea Level Rise

The melting of ice sheets in Greenland and Antarctica, along with thermal expansion of seawater as it warms, leads to rising sea levels. This poses a significant risk to coastal areas, potentially displacing millions of people and causing economic loss.

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Impact on Biodiversity

Climate change affects biodiversity by altering habitats and ecosystems. Species that cannot adapt to changing conditions face the threat of extinction. Arctic species such as polar bears are particularly vulnerable due to the loss of sea ice.

Mitigation and Adaptation

Addressing global warming requires both mitigation, to reduce greenhouse gas emissions, and adaptation, to cope with the changes that have already occurred.

Renewable Energy

Transitioning to renewable energy sources such as wind, solar, and hydroelectric power can significantly reduce CO₂ emissions. These technologies produce energy without burning fossil fuels, thus mitigating the greenhouse effect.

Energy Efficiency

Improving energy efficiency in homes, businesses, and transportation can also reduce emissions. This can include better insulation, energy-efficient appliances, and fuel-efficient vehicles.

Afforestation and Reforestation

Planting trees and restoring forests can absorb CO₂ from the atmosphere, helping to offset emissions from other sources. Protecting existing forests is equally important.

Sustainable Agriculture

Adopting sustainable agricultural practices can reduce methane and nitrous oxide emissions. This may include improving livestock management, using fertilizers more efficiently, and exploring alternative crops.

International Agreements

International agreements such as the Paris Agreement aim to unite countries in the effort to combat climate change. These agreements set targets for reducing emissions and provide frameworks for cooperation and support.

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Conclusion

The science behind the Earth's rising temperature is clear: human activities are driving global warming through the increased emission of greenhouse gases. Addressing this challenge requires concerted efforts in mitigation and adaptation to protect our planet and ensure a sustainable future for all its inhabitants.