Why in News
A UCLA study titled “Spotlight on the Top 25 Methane Plumes in 2025: Landfills” — using data from Planet Labs’ Tanager-1 satellite and NASA’s EMIT instrument (aboard the International Space Station) — found that India has two landfills among the world’s 25 largest methane emitters:
- Jawaharnagar landfill, Secunderabad (Hyderabad): 4th globally — 5.9 tonnes/hour
- Mumbai landfill: 12th globally — 4.9 tonnes/hour
The climate impact of 5 t/hr methane is equivalent to 1 million large SUVs or a 500 MW coal power plant operating continuously.
The Technology — How Satellites Detect Landfill Methane
NASA EMIT (Earth Surface Mineral Dust Source Investigation)
- Installed on the International Space Station in July 2022
- Originally designed to map surface minerals, it was discovered to also detect methane plumes with high precision
- Measures methane in parts per million (ppm) from Low Earth Orbit
- Has detected >1,000 “super-emitter” methane sources globally
Planet Labs Tanager-1
- A commercial satellite by Planet Labs
- Equipped with a methane imaging spectrometer specifically designed for GHG detection
- Much higher revisit frequency than government satellites — enabling systematic monitoring
Landfill Methane — The Science
How Landfills Produce Methane
| Step | Process |
|---|---|
| 1 | Organic waste (food scraps, paper, yard waste) deposited in landfill |
| 2 | Anaerobic bacteria decompose organic matter without oxygen |
| 3 | Decomposition produces biogas: ~50-60% CH₄ (methane) + ~40-50% CO₂ |
| 4 | CH₄ escapes through landfill surface (if not captured) |
Why Methane Matters
| Property | Detail |
|---|---|
| GWP (100-year) | 28x more potent than CO₂ |
| GWP (20-year) | 80x more potent than CO₂ (short-lived but powerful) |
| Atmospheric lifetime | ~12 years (vs CO₂: centuries) |
| Climate impact | Responsible for ~0.5°C of observed warming since industrial era |
Landfills contribute ~11% of India’s methane emissions (the rest comes from agriculture — paddy fields, enteric fermentation in livestock).
India’s Two Super-Emitting Landfills
1. Jawaharnagar Landfill (Secunderabad/Hyderabad)
| Parameter | Data |
|---|---|
| Location | Secunderabad, Hyderabad, Telangana |
| Global rank | 4th — world’s 4th largest landfill methane emitter |
| Emission rate | 5.9 tonnes/hour |
| Operator | Ramky Enviro Engineers Ltd |
| Area | ~100 hectares |
| Status | Active open dump; receives ~2,000 tonnes/day of MSW |
2. Mumbai Landfill
| Parameter | Data |
|---|---|
| Location | Mumbai, Maharashtra |
| Global rank | 12th |
| Emission rate | 4.9 tonnes/hour |
| Operator | Antony Waste Handling Cell Ltd |
| Key sites | Deonar (Asia’s oldest landfill, ~130 ha) or Kanjurmarg site |
India’s Waste Management — Governance Failure
Scale of the Problem
| Indicator | Data |
|---|---|
| MSW generated daily | ~170,000 tonnes |
| MSW that is landfilled | ~40-50% (insufficient segregation + processing) |
| Open dumpsites | 3,000+ across India |
| Landfill area | Thousands of hectares nationally |
| Landfill gas utilised | <5% (most escapes uncontrolled) |
The Regulatory Gap
- Solid Waste Management Rules, 2016: mandated source segregation, processing, and scientific landfilling — largely unimplemented
- Extended Producer Responsibility (EPR): operational for plastics; not yet effective for organic waste-to-landfill reduction
- Swachh Bharat Mission: reduced open defecation but did not adequately address MSW processing
- Landfill gas capture: only a handful of Indian cities (Kolkata, Surat) have any LFG capture-to-energy systems
What Should Be Done
- Source segregation — wet (organic) + dry (recyclable) + hazardous: reduces landfill organic load
- Composting and biomethanation — convert wet waste to compost or biogas instead of landfilling
- Landfill gas-to-energy (LFGE) — capture methane, generate electricity (CDM projects possible)
- Extended Producer Responsibility — shift waste management cost to producers
UPSC Relevance
Prelims
- UCLA study: Spotlight on the Top 25 Methane Plumes in 2025: Landfills
- Satellites used: Tanager-1 (Planet Labs) + EMIT (NASA, ISS)
- Hyderabad (Jawaharnagar): 4th globally; 5.9 t/hr; Ramky Enviro Engineers
- Mumbai: 12th globally; 4.9 t/hr; Antony Waste Handling Cell
- Methane GWP: 28x CO₂ (100-year); 80x CO₂ (20-year)
Mains
- “India’s solid waste management failures are now a measurable climate liability. Analyse with reference to landfill methane emissions.” (GS3)
- EPR, SWM Rules 2016, Swachh Bharat — governance gaps in waste management
Facts Corner
| Fact | Detail |
|---|---|
| Study | UCLA — Spotlight on Top 25 Methane Plumes in 2025: Landfills |
| Data sources | Tanager-1 (Planet Labs) + NASA EMIT (on ISS) |
| Hyderabad rank | 4th globally — Jawaharnagar, Secunderabad |
| Hyderabad emission | 5.9 tonnes/hour |
| Hyderabad operator | Ramky Enviro Engineers Ltd |
| Mumbai rank | 12th globally |
| Mumbai emission | 4.9 tonnes/hour |
| Mumbai operator | Antony Waste Handling Cell Ltd |
| Methane climate impact | 5 t/hr ≈ 1 million SUVs or 500 MW coal plant |
| Methane GWP | 28x CO₂ (100-year); 80x (20-year) |
| Landfills in top 25 | India: 2 (of global 25) |
| SWM Rules | Solid Waste Management Rules, 2016 |
