Methane is a very potent green house gas. It is converted to carbon dioxide to ease its overall effect on global warming. This process is known as :

1. The Greenhouse Effect and Primary GHGs (basic)

To understand global warming, we must first understand the Greenhouse Effect. Imagine a glass house used to grow plants in cold climates. The glass allows short-wave solar radiation (light) to pass through easily, warming the interior. However, once the ground and plants inside warm up, they emit long-wave thermal radiation (heat). This heat cannot easily escape back through the glass, trapping it inside and keeping the plants warm. Our atmosphere acts in exactly the same way. FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.), World Climate and Climate Change, p.96

The atmosphere is transparent to incoming solar radiation but opaque to outgoing long-wave radiation emitted by the Earth. This trapping of heat is what makes Earth habitable; without it, our planet would be too cold for life. However, when human activities increase the concentration of Greenhouse Gases (GHGs), the atmosphere traps more heat than necessary, leading to global warming. Environment, Shankar IAS Academy (ed 10th), Climate Change, p.254

The primary gases responsible for this effect vary in their prevalence and potency. While Water Vapour and Carbon Dioxide (CO₂) are the most abundant and critical natural GHGs, others like Methane (CH₄) and Nitrous Oxide (N₂O) play significant roles. Additionally, there are highly potent synthetic gases like Hydrofluorocarbons (HFCs) and Sulphur Hexafluoride (SF₆) which, though present in smaller quantities, have a much higher capacity to trap heat. Environment, Shankar IAS Academy (ed 10th), Environment Issues and Health Effects, p.426

Type of GHG	Primary Examples	Source/Note
Natural & Anthropogenic	CO₂, CH₄, N₂O, Water Vapour	Essential for life but dangerous in excess.
Synthetic/Industrial	HFCs, PFCs, SF₆	Highly potent and purely human-made.

Sources: FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.), World Climate and Climate Change, p.96; Environment, Shankar IAS Academy (ed 10th), Climate Change, p.254; Environment, Shankar IAS Academy (ed 10th), Environment Issues and Health Effects, p.426; Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Climate Change, p.9

2. Global Warming Potential (GWP) and CO₂ Equivalents (intermediate)

To understand the impact of various greenhouse gases (GHGs) on our planet, we cannot simply look at the volume of gas emitted. This is because different gases have vastly different abilities to trap heat and remain in the atmosphere for different lengths of time. Global Warming Potential (GWP) was developed as a metric to compare the global warming impacts of different gases. Specifically, GWP is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period (usually 100 years), relative to the emissions of 1 ton of carbon dioxide (CO₂). As noted in Environment, Shankar IAS Academy (ed 10th), Climate Change, p.260, the two critical factors determining a gas's GWP are its radiative efficiency (how well it absorbs long-wave radiation) and its atmospheric lifetime.

Carbon dioxide is used as the reference gas and is assigned a GWP of 1. If a gas has a GWP of 25, it means that 1 ton of that gas is 25 times more effective at warming the planet than 1 ton of CO₂ over that time period. For instance, Methane (CH₄) is significantly more potent than CO₂. While it stays in the atmosphere for a much shorter duration (about 12 years), it is far more efficient at trapping heat, giving it a 100-year GWP that is often cited between 21 and 28 Environment, Shankar IAS Academy (ed 10th), Climate Change, p.260. This high potency is why industries sometimes use flaring—burning methane to turn it into CO₂—because releasing CO₂ is actually less harmful to the climate than releasing the raw methane.

To make reporting and policy-making simpler, scientists use the concept of CO₂ Equivalents (CO₂e). This allows us to bundle different GHGs into a single number. To calculate the CO₂ equivalent of a specific gas, you simply multiply the mass of the gas emitted by its GWP. As explained in Environment, Shankar IAS Academy (ed 10th), Environment Issues and Health Effects, p.425, this conversion provides a common scale, helping us understand the total 'warming footprint' of an activity, whether it emits methane from a farm or CO₂ from a car.

Greenhouse Gas	GWP (100-year)	Atmospheric Lifetime
Carbon Dioxide (CO₂)	1	Variable (centuries)
Methane (CH₄)	~21-28	~12 years
Nitrous Oxide (N₂O)	~265-310	~121 years
HFCs / PFCs	1,000 to 10,000+	Up to 50,000 years

Sources: Environment, Shankar IAS Academy (ed 10th), Climate Change, p.260; Environment, Shankar IAS Academy (ed 10th), Environment Issues and Health Effects, p.425

3. Methane (CH₄): Sources and Atmospheric Lifetime (intermediate)

While Carbon Dioxide (CO₂) is often the focus of climate discussions, Methane (CH₄) is a critical "short-lived climate pollutant" that packs a much heavier punch in the short term. Methane is roughly 20 to 28 times more powerful than CO₂ at trapping heat over a 100-year period. However, its atmospheric lifetime is relatively short—about 10 to 12 years—compared to the centuries CO₂ can persist. This means that if we reduce methane emissions today, we see the cooling benefits much faster than with almost any other greenhouse gas Environment and Ecology, Majid Hussain, Climate Change, p.11.

Methane is primarily generated through anaerobic processes (decomposition in the absence of oxygen). This occurs naturally in wetlands, but human activities have significantly amplified these levels. Globally, the Agriculture sector is the largest source, specifically through enteric fermentation (digestive processes in cattle and sheep) and the cultivation of rice paddies, where underwater bacteria thrive in oxygen-poor soil Environment, Shankar IAS Academy, Climate Change, p.256. Beyond farming, methane is the primary component of natural gas; therefore, leaks during drilling, refining, and pipeline transport act as significant industrial sources of "fugitive emissions" Environment, Shankar IAS Academy, Environment Issues and Health Effects, p.426.

To manage these emissions in industrial settings, a process called flaring is often used. Flaring involves the controlled combustion of methane, converting it into CO₂, water, and heat: CH₄ + 2O₂ → CO₂ + 2H₂O. While this still releases a greenhouse gas (CO₂), it is considered a mitigation strategy because the Global Warming Potential (GWP) of the resulting CO₂ is much lower than that of the uncombusted methane that would have otherwise leaked into the atmosphere. Essentially, flaring converts a very potent warming agent into a less potent one.

Sources: Environment and Ecology, Majid Hussain, Climate Change, p.11; Environment, Shankar IAS Academy, Climate Change, p.256; Environment, Shankar IAS Academy, Environment Issues and Health Effects, p.426

4. Global Policy: The Global Methane Pledge (exam-level)

To understand the **Global Methane Pledge**, we must first look at why methane (CH₄) is such a high-priority target for climate policy. While Carbon Dioxide (CO₂) is the most famous greenhouse gas, methane is significantly more 'potent' in the short term. As a coach, I often tell students to think of methane as a 'sprint' and CO₂ as a 'marathon'; methane doesn't stay in the atmosphere nearly as long (about 12 years compared to CO₂'s centuries), but while it is there, it is over 21 to 28 times more effective at trapping heat Environment, Shankar IAS Academy (10th ed.), Climate Change, p.260. Because of this high **Global Warming Potential (GWP)** and short atmospheric life, cutting methane emissions offers the fastest way to slow down global temperature rise in the next decade. Launched at COP26 in Glasgow, the **Global Methane Pledge (GMP)** is an initiative led by the **United States** and the **European Union**. It asks participating countries to voluntarily commit to a collective goal of reducing global methane emissions by at least **30% from 2020 levels by 2030** Environment, Shankar IAS Academy (10th ed.), Climate Change Organizations, p.335. Unlike the Kyoto Protocol, which set legally binding targets for industrialized nations NCERT Class XII, Environment and Natural Resources, p.87, the GMP is a non-binding political commitment. It focuses on the three main human-caused sources of methane: **agriculture** (livestock and rice paddies), **energy** (leaks from oil and gas wells), and **waste** (landfills). A crucial strategy used in the energy sector to meet these goals is **flaring**. This is the process of burning 'excess' methane that cannot be captured, converting it into CO₂ and water vapor. While it might seem counterintuitive to release CO₂, it is actually a mitigation strategy because the GWP of the resulting CO₂ is much lower than the raw methane that would otherwise be vented into the atmosphere. For a UPSC aspirant, it is also important to note that while over 150 countries have joined, **India** is not a signatory, primarily due to concerns that strict methane targets could impact the livelihoods of small-scale farmers and the livestock sector, which are vital components of the Indian economy.

Methane vs. Carbon Dioxide Comparison

Feature	Methane (CH₄)	Carbon Dioxide (CO₂)
Atmospheric Lifetime	~12 Years	100+ Years
GWP (100-year scale)	21 - 28	1 (The Baseline)
Primary Human Sources	Livestock, Wetlands, Gas Leaks	Fossil fuel combustion, Deforestation

Sources: Environment, Shankar IAS Academy (10th ed.), Climate Change, p.260; Environment, Shankar IAS Academy (10th ed.), Climate Change Organizations, p.335; NCERT Class XII Contemporary World Politics, Environment and Natural Resources, p.87

5. Alternate Methane Management: Bio-methanation (intermediate)

Bio-methanation, often referred to as Anaerobic Digestion, is a biological process where organic waste is broken down by microorganisms in the absence of oxygen. This process is a cornerstone of the 'Waste-to-Wealth' philosophy. Instead of allowing organic matter—such as agricultural residues, cattle dung, or municipal waste—to rot in open landfills and release methane (CH₄) directly into the atmosphere, bio-methanation captures this gas in a controlled environment. Since methane is a potent greenhouse gas with a global warming potential significantly higher than CO₂, capturing it for use is a vital climate mitigation strategy Geography of India, Energy Resources, p.30.

The process yields two high-value outputs that promote a circular economy:

• Biogas: A mixture primarily consisting of Methane (CH₄) and Carbon Dioxide (CO₂). This is a clean source of energy that can be used for cooking, lighting, or even converted into electricity, significantly reducing the pressure on traditional fuel wood INDIA PEOPLE AND ECONOMY, Mineral and Energy Resources, p.64.
• Digested Slurry: The leftover organic matter acts as a high-quality bio-fertilizer. It is rich in essential plant nutrients like Nitrogen, Phosphate, and Potassium, helping to restore soil health without the heavy use of chemical fertilizers Environment, Shankar IAS Academy, Agriculture, p.364.

Unlike flaring (which simply burns methane to convert it into the less harmful CO₂), bio-methanation utilizes the energy potential of the gas. This makes it particularly effective for managing Municipal Solid Waste (MSW) in urban centers and improving sanitation and hygiene in rural areas Environment and Ecology, Majid Hussain, Environmental Degradation and Management, p.44. By processing garbage and industrial waste, it reduces environmental pollution while enhancing self-reliance in energy INDIA PEOPLE AND ECONOMY, Mineral and Energy Resources, p.64.

Feature	Bio-methanation	Open Landfilling
Oxygen Requirement	Anaerobic (No Oxygen)	Aerobic/Anaerobic (Uncontrolled)
Methane Impact	Captured for Fuel	Vented (High Global Warming)
By-products	Biogas + Nutrient-rich Manure	Leachate + Atmospheric Pollution

Sources: Geography of India, Energy Resources, p.30; INDIA PEOPLE AND ECONOMY, Mineral and Energy Resources, p.64; Environment, Shankar IAS Academy, Agriculture, p.364; Environment and Ecology, Majid Hussain, Environmental Degradation and Management, p.44

6. Industrial Mitigation: Venting vs. Flaring (exam-level)

In the oil and gas industry, surplus gas—primarily methane (CH₄)—is often produced during extraction or maintenance. Since methane can make up 80% to 90% of natural gas Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.15, managing its release is critical for climate mitigation. There are two primary ways industry handles this: Venting and Flaring.

Venting is the direct release of unburned gases into the atmosphere. This is the most damaging option because methane is a highly potent greenhouse gas, responsible for approximately 12% of total atmospheric warming Environment and Ecology, Majid Hussain, Climate Change, p.11. In contrast, Flaring involves the controlled combustion of these gases. Chemically, flaring converts methane into carbon dioxide (CO₂) and water vapor (CH₄ + 2O₂ → CO₂ + 2H₂O). While both processes release greenhouse gases, flaring is considered a mitigation strategy because CO₂ has a significantly lower Global Warming Potential (GWP) than methane.

Feature	Venting	Flaring
Process	Direct release of raw gas.	Controlled burning of gas.
Primary Emission	Methane (CH₄)	Carbon Dioxide (CO₂)
Climate Impact	High (CH₄ is ~28x more potent than CO₂).	Lower (Converts high-GWP gas to lower-GWP gas).
Safety	Can create explosive hazards.	Safer; eliminates pressure and combustible gas.

While the ideal solution is gas capture—where the gas is stored and used for energy—flaring serves as a vital "lesser of two evils" when infrastructure or storage is unavailable. It effectively reduces the immediate warming impact of industrial operations by trading a high-impact pollutant (methane) for a lower-impact one (carbon dioxide).

Sources: Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.15; Environment and Ecology, Majid Hussain, Climate Change, p.11

7. Solving the Original PYQ (exam-level)

This question is a perfect application of the Global Warming Potential (GWP) hierarchy you just studied. While we often focus on Carbon Dioxide as the primary culprit of climate change, you have learned that Methane (CH4) is significantly more "potent"—meaning it traps much more heat per molecule over a shorter time frame. When you see a question asking how to "ease" the effect of a potent gas by turning it into a less potent one, your mind should immediately go to chemical conversion through combustion. This is the practical bridge between atmospheric chemistry and industrial environmental management.

To arrive at the correct answer, (C) Flaring, think like a site engineer: if you cannot capture the methane for use, you cannot simply let it "vent" into the atmosphere because its GWP is over 20-28 times that of CO2. By burning it—a process technically called flaring—you oxidize the methane into CO2 and water vapor. As a coach, I want you to remember that flaring is a mitigation strategy of the "lesser evil"; we accept the release of CO2 to prevent the much more damaging release of pure methane. According to the World Bank Global Gas Flaring Reduction Partnership, this remains a critical, albeit transitional, practice in oil and gas operations to manage climate impact.

UPSC often includes distractors that sound "atmospheric" or "structural" to catch students who are guessing. Terms like Blocking and Ceiling (Options A and B) might sound like they refer to "blocking" radiation or "carbon ceilings," but they are not technical terms for gas conversion. Stooping (Option D) is an irrelevant term used as a filler. Always look for the specific industrial or chemical term that describes the actual physical process being discussed—in this case, the controlled burning of waste gas at a terminal or rig.