Question
A bond whose proceeds are used only to finance or refinance a combination of both environmental and social projects is called:
AGreen Bond
BSocial Bond
CSustainability Bond ✓
DSovereign Bond
The Simple Formula to Remember
Green Bond
(Environment only)
+
(Environment only)
Social Bond
(Social only)
=
(Social only)
Sustainability Bond
(Both combined)
(Both combined)
Why Each Option is Right or Wrong
A
✗ Green Bond
Proceeds used exclusively for environmental projects only:• Renewable energy (solar, wind)
• Clean transportation
• Sustainable water management
• Climate change adaptation
• Green buildings
Cannot be used for social projects. India issued its first Sovereign Green Bond in Jan 2023.
B
✗ Social Bond
Proceeds used exclusively for social projects only:• Affordable housing
• Access to healthcare
• Food security
• Education and vocational training
• Socioeconomic advancement for underserved populations
Cannot be used for environmental projects.
C
✓ Sustainability Bond — THE ANSWER
Proceeds used for a combination of both environmental AND social projects. ICMA (International Capital Market Association) definition: “Bonds where the proceeds will be exclusively applied to finance or refinance a combination of both Green and Social Projects.”Examples: A hospital with solar panels (green) + affordable healthcare (social) · Green affordable housing · Sustainable agriculture for food security.
D
✗ Sovereign Bond
A bond issued by a national government — classified by issuer type, not use of proceeds. A Sovereign Bond can be used for any government expenditure (defence, infrastructure, salaries) — it has no environmental or social restriction. A Sovereign Green Bond is different — a government-issued bond with green use of proceeds.
ESG Bonds — Complete Classification for UPSC
| Bond Type | Use of Proceeds | Governed by | India Example |
| 🌿 Green Bond | Environmental projects ONLY — renewable energy, clean transport, climate adaptation, green buildings | ICMA Green Bond Principles | Sovereign Green Bond (Jan 2023, ₹8,000 crore) · IREDA green bonds · SBI green bonds |
| 🤝 Social Bond | Social projects ONLY — affordable housing, healthcare, education, food security, poverty alleviation | ICMA Social Bond Principles | NHB social bonds for affordable housing · NABARD rural development bonds |
| ♻️ Sustainability Bond ✓ | BOTH environmental AND social projects combined | ICMA Sustainability Bond Guidelines | SEBI’s integrated green and social bond framework |
| 📊 Sustainability-Linked Bond | General purposes — but issuer must meet pre-defined sustainability KPIs or pay penalty | ICMA SLB Principles | ReNew Power SLB (2021) — linked to renewable energy capacity targets |
| 🏛️ Sovereign Bond | General government expenditure — NO specific environmental/social restriction | Issuer’s own terms | Government of India bonds (T-Bills, G-Secs) — general fiscal purposes |
Memory Trick
🧠 Green + Social = Sustainability (G + S = S)
The equation: 🌿 + 🤝 = ♻️ — Green Bond + Social Bond = Sustainability Bond. When a bond finances BOTH environmental and social purposes together, it is called a Sustainability Bond. This is literally the ICMA definition.
Sovereign Bond is about WHO issues, not WHAT FOR: Sovereign = government issuer. The question asks about the use of proceeds — environmental + social. Sovereign Bond is classified by issuer type. Don’t confuse issuer classification with use-of-proceeds classification.
Sustainability-Linked Bond ≠ Sustainability Bond: A Sustainability Bond = use of proceeds goes to green + social projects. A Sustainability-Linked Bond (SLB) = proceeds used for any purpose but issuer must meet ESG targets. Two completely different instruments.
