Climate change refers to long-term changes in temperature and weather patterns. The climate differs depending on the region. It is changing now through time as a result of both natural and anthropogenic factors such as volcanism, greenhouse effect, plate tectonics, ocean currents, greenhouse gases, aerosols, land use patterns etc. Glacial and interglacial periods, high altitudes and high latitudes features, occurrence of warm and cold periods, tree rings revealing wet and dry periods - all this evidence suggests that continuous changes have occurred for many years which lead to climate change. In this article, we will discuss Causes of Climate Change which will be helpful for UPSC exam preparation.

Causes of Climate Change

Natural Causes

Continental Drift

• For millions of years, the movement of the tectonic plates has occurred.
• The movement of these plates causes changes in the physical characteristics of the landmass as well as the location of water bodies on the earth's surface.
• This causes a shift in weather patterns, which contributes to climate change over time.

Plate Tectonics

• Plate displacement is caused by the continuous change in temperature of the core of the Earth's surface.
• This has an impact on the local temperature of the environment as well as other codependent environmental elements, which causes climate change.

Volcanic Activity

• Although a volcano's eruption lasts only a few minutes, the consequences might last for years.
• A vast amount of carbon dioxide, dust particles, aerosol droplets, and other greenhouse gases enter the earth's atmosphere when lava erupts from a volcano.
• These gases, when discharged in high concentrations, potentially warm the earth's atmospheric layers and contribute to global warming.

Ocean Currents

• The horizontal movement of winds opposes the natural flow of ocean currents. As a result, it causes temperature variation, which leads to a change in the climate of the specific geographic region.

Variation in Earth’s Orbit

• The seasonal distribution of sunlight reaching the Earth's surface is affected by the Earth's orbit, causing an impact on geographical and seasonal variation, thus contributing to climate change.

Anthropogenic Causes

Generating Power

• The use of fossil fuels to generate electricity and heat contributes significantly to global emissions.
• The majority of electricity is still generated by burning coal, oil, or gas, which emits carbon dioxide and nitrous oxide, both of which are powerful greenhouse gases that blanket the Earth and trap the sun's heat.
• Wind, solar, and other renewable energy sources generate slightly more than a quarter of global electricity and, unlike fossil fuels, emit little to no greenhouse gases or pollutants into the atmosphere.

Manufacturing Goods

• Manufacturing and industry generate emissions, primarily from the combustion of fossil fuels to generate energy for the production of cement, iron, steel, electronics, plastics, clothing, and other goods.
• Mining and other industrial processes, as well as the construction industry, emit gases.
• Machines used in the manufacturing process are frequently powered by coal, oil, or gas, and some materials, such as plastics, are made with chemicals derived from fossil fuels.
• The manufacturing industry is one of the largest contributors to greenhouse gas emissions worldwide.

Deforestation

• Cutting down forests to make farms or pastures, or for other reasons, causes emissions because trees release the carbon they have been storing when they are cut down.
• Approximately 12 million hectares of forest are destroyed each year.
• Because forests absorb CO2, destroying them reduces nature's ability to keep emissions out of the atmosphere.
• Deforestation, along with agriculture and other land use changes, accounts for approximately one-quarter of global greenhouse gas emissions.

Using Transportation

• The majority of automobiles, trucks, ships, and planes run on fossil fuels.
• As a result, transportation is a major source of greenhouse gases, particularly carbon dioxide emissions.
• The combustion of petroleum-based products, such as gasoline, in internal combustion engines accounts for the majority of the contribution.
• Transportation accounts for nearly a quarter of global energy-related CO2 emissions.

Powering Buildings

• Residential and commercial buildings consume more than half of all electricity worldwide.
• They continue to emit significant amounts of greenhouse gas emissions as they continue to rely on coal, oil, and natural gas for heating and cooling.
• Rising energy demand for heating and cooling, as well as increased electricity consumption for lighting, appliances, and connected devices, has contributed to a recent increase in energy-related carbon-dioxide emissions from buildings.

Greenhouse gases

• Greenhouse gases are gases that absorb heat radiation from the sun and cause an increase in the temperature of the Earth's surface.
• Carbon dioxide, chlorofluorocarbons, water vapours, methane, and nitrous oxide are examples.
• Because of industrialisation, deforestation, and urbanisation, the concentrations of these gases in the atmosphere are increasing day by day, contributing to global warming resulting in climate change.

Atmospheric Aerosols

• Aerosols are extremely small liquid particles that are trapped in the Earth's atmosphere.
• Their presence can be induced by a variety of activities, including coal combustion, the combustion of plants grown with ammonia-containing fertilisers, biomass combustion, and other industrial processes.
• They scatter and absorb solar and infrared radiation, causing the temperature of atmospheric layers to fluctuate substantially.
• They also have an impact on the physical and chemical composition of clouds, as well as cloud formation.

Effects of Climate Change

• The rise in global temperature
• The rise in sea level
• Shrinking of ice sheets
• Warming of oceans
• Declining of ice at Arctic Sea
• The retreat of the glaciers
• Decreasing snow cover
• Acidification of Ocean
• Extreme and disastrous natural events

Measures to Control Climate Change

• Maintain the use of fossil fuels: Coal, oil, and gas are examples of fossil fuels, and the more of them extracted and burned, the worse climate change will become. All countries must transition away from fossil fuels as soon as possible.
• Invest in renewable energy sources: Changing our primary energy sources to clean and renewable energy is the most effective way to phase out the use of fossil fuels. Solar, wind, wave, tidal, and geothermal power are examples of such technologies.
• Change to more environmentally friendly transportation: Fossil fuels are used in gasoline and diesel vehicles, planes, and ships. Reducing car use, switching to electric vehicles, and limiting air travel will not only help to combat climate change, but will also help to reduce air pollution.
• Assist us in keeping our homes warm: Draughty and cold homes are a waste of money and miserable in the winter. The government can assist households in heating their homes in a more environmentally friendly manner, such as by insulating walls and roofs and switching from oil or gas boilers to heat pumps.
• Improve farming practises and promote vegan diets: Individuals can help stop climate change by reducing their meat and dairy consumption or going completely vegan. Businesses and food retailers can help people make the switch by improving farming practises and stocking more plant-based products.
• Restore nature's ability to absorb more carbon: The natural world does an excellent job of cleaning up our emissions, but we must take care of it. Planting trees in the right places or giving land back to nature through ‘rewilding’ schemes is a good place to start. This is due to the fact that photosynthesising plants absorb carbon dioxide as they grow, storing it in soils.
• Protect Amazonian forests: Forest protection is an important climate solution because forests are critical in the fight against climate change. Industrial-scale forest destruction destroys massive trees that could be absorbing massive amounts of carbon. Companies, on the other hand, destroy forests to make way for animal farming, soya, or palm oil plantations. Governments can put a stop to it by making better policies.
• Save the oceans: Oceans also absorb a large amount of CO2 from the atmosphere, which helps to stabilise our climate. However, many are overfished, used for oil and gas drilling, or are under threat from deep sea mining. Ultimately, protecting the oceans and the life within them is a way to protect ourselves from climate change.
• Reduce people's consumption: Our modes of transportation, clothing, food, and other lifestyle choices all have different effects on the environment. However, while reducing consumption of these products may be difficult, it is unquestionably worthwhile. Reducing overall consumption in more affluent countries can help reduce environmental stress.
• Plastic should be reduced: Plastic is made from oil, and the extraction, refining, and transformation of oil into plastic (or even polyester for clothing) is a surprisingly carbon-intensive process. Because it does not degrade quickly in nature, a lot of plastic is burned, contributing to emissions.

Conclusion

Climate change is a continuous and never-ending phenomenon. International cooperation to fight climate change is crucial to minimize its negative effects. Furthermore, mitigation must be supplemented with climate change-related adaptation, international conventions, protocols, agreements as mitigation alone cannot solve the current negative effects. A comprehensive plan of action at the international level is required for the sustainable progress of the global community.

FAQs

MCQs

1. Which of the following is a primary human-induced cause of climate change?

A) Solar radiation
B) Volcanic activity
C) Deforestation
D) Ocean currents

2. What is the effect of greenhouse gases on climate?

A) They cool the Earth's atmosphere
B) They absorb sunlight
C) They trap heat in the Earth's atmosphere
D) They reduce the Earth's temperature

3. Which gas is primarily responsible for global warming?

A) Oxygen
B) Nitrous oxide
C) Carbon dioxide
D) Hydrogen

4. Which activity releases the highest amount of CO2 into the atmosphere?

A) Agriculture
B) Fossil fuel combustion
C) Deforestation
D) Solar power generation

5. Which of the following is a natural cause of climate change?

A) Industrial emissions
B) Deforestation
C) Volcanic eruptions
D) Urbanization

GS Mains Questions and Model Answers

Q1: Explain the relationship between greenhouse gases and global warming. How do they contribute to climate change?

Answer: Greenhouse gases, such as CO2, methane, and nitrous oxide, trap heat in the Earth's atmosphere, causing a warming effect known as the greenhouse effect. These gases absorb and re-emit infrared radiation, preventing heat from escaping into space, leading to an increase in global temperatures. The enhanced greenhouse effect, caused by human activities such as burning fossil fuels and deforestation, has led to accelerated global warming. This warming is responsible for shifts in weather patterns, rising sea levels, and increasing frequency of extreme weather events, all of which contribute to ongoing climate change.

Q2: Discuss the role of human activities in climate change. What measures can be taken to reduce human impact on the climate?

Answer: Human activities, including burning fossil fuels, deforestation, and industrial processes, release large amounts of greenhouse gases into the atmosphere, driving climate change. These activities enhance the greenhouse effect, leading to higher global temperatures and changes in weather patterns. To mitigate human impact on the climate, measures such as transitioning to renewable energy sources, improving energy efficiency, protecting forests, and adopting sustainable agricultural practices are essential. Additionally, international cooperation, such as adherence to the Paris Agreement, is crucial for coordinated global efforts to limit global warming and adapt to the impacts of climate change.

Q3: How does deforestation contribute to the greenhouse effect and accelerate climate change?

Answer: Deforestation contributes to climate change by reducing the number of trees available to absorb carbon dioxide (CO2) from the atmosphere. Trees act as carbon sinks, sequestering CO2 that would otherwise contribute to the greenhouse effect. When forests are cleared, not only is the CO2 absorption capacity diminished, but the carbon stored in trees is released back into the atmosphere as CO2, further exacerbating the greenhouse effect. This accelerates global warming and climate change, leading to altered weather patterns, increased frequency of extreme weather events, and rising sea levels.

Previous Year Questions on Climate Change

1. UPSC CSE Mains 2019 (GS Paper 3):

Question: "Discuss the various human-induced causes of climate change and the potential consequences for India."

Answer: Human-induced causes of climate change include deforestation, fossil fuel combustion, and industrial emissions. These activities release significant amounts of greenhouse gases into the atmosphere, leading to global warming. In India, the consequences include rising temperatures, altered rainfall patterns, and an increased frequency of extreme weather events like droughts, floods, and heatwaves. The impact on agriculture, water resources, and health could be devastating, affecting millions of people, especially in vulnerable regions.

2. UPSC CSE Mains 2020 (GS Paper 3):

Question: "Examine the role of carbon dioxide in global warming and climate change. How can its levels be reduced?"

Answer: Carbon dioxide (CO2) is a major greenhouse gas responsible for global warming. Its increasing concentration in the atmosphere, due to human activities like burning fossil fuels and deforestation, intensifies the greenhouse effect, leading to rising global temperatures. To reduce CO2 levels, a transition to renewable energy sources, enhancing energy efficiency, afforestation, and carbon capture technologies are essential. International efforts to reduce emissions, such as those outlined in the Paris Agreement, are crucial in addressing global warming and mitigating climate change.