The IPCC reports are the world’s most authoritative scientific assessments of climate change — and they are a consistently tested topic in UPSC Prelims, SSC CGL, Banking, State PSC, and environment-based competitive exams.
The Intergovernmental Panel on Climate Change (IPCC), established in 1988, publishes comprehensive Assessment Reports every 5–7 years, synthesising thousands of scientific studies into actionable findings for policymakers. This page gives you a complete, updated list of all IPCC Assessment Reports with their key findings, landmark conclusions, associated climate targets, and exam-critical facts for confident revision.
⚡ Quick Facts
- The IPCC was established in 1988 jointly by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO); HQ in Geneva, Switzerland.
- The IPCC has published 6 Assessment Reports (AR1–AR6) since 1990 — the latest is AR6, published between 2021 and 2023.
- IPCC AR5 (2013–2014) formed the scientific basis for the Paris Agreement (2015) — committing nations to limit warming to 1.5°C–2°C above pre-industrial levels.
- The IPCC shared the Nobel Peace Prize in 2007 with Al Gore for building knowledge about climate change.
- IPCC AR6 (2021–2023) declared climate change “unequivocal” — UN Secretary-General called it “Code Red for Humanity.”
The IPCC does NOT conduct its own research — it reviews, synthesises, and assesses existing peer-reviewed scientific literature. Also: the Nobel Prize in 2007 was shared with Al Gore — not Rajendra Pachauri (who was IPCC Chair at the time). The term “unequivocal” first appeared in AR4 (2007) for general warming, but its strongest form is in AR6 (2021). AR5 → Paris Agreement; AR2 → Kyoto Protocol — don’t mix these up. The “Code Red” phrase was for AR6 WGI (August 2021), not the AR6 Synthesis Report (2023).
✅ My Progress Tracker
📊 IPCC Assessment Reports — AR1 to AR6
| # ↕ | Report ↕ | Year ↕ | Landmark Statement / Key Finding | Policy Impact / Linked COP |
|---|---|---|---|---|
| 1 | FAR / AR1 (First Assessment Report) | 1990 | Confirmed human-caused GHG emissions are increasing; projected 0.3°C warming per decade; sea level rise predicted | Led to UNFCCC (1992) at Earth Summit, Rio de Janeiro |
| 2 | SAR / AR2 (Second Assessment Report) | 1995 | “The balance of evidence suggests a discernible human influence on global climate” — landmark statement; projected 1–3.5°C rise by 2100 | Scientific basis for Kyoto Protocol (1997) — first binding emission reduction treaty |
| 3 | TAR / AR3 (Third Assessment Report) | 2001 | “Most of the warming observed over the last 50 years is attributable to human activities” — stronger attribution than AR2; ice sheet data | Built case for post-Kyoto action; Bonn Agreement; Marrakesh Accords (COP7) |
| 4 | AR4 (Fourth Assessment Report) | 2007 | “Warming of the climate system is unequivocal” — first categorical statement; Arctic ice loss; 11 of 12 warmest years on record (1850–2006) | Nobel Peace Prize 2007 (IPCC + Al Gore); Bali Action Plan (COP13, 2007) |
| 5 | AR5 (Fifth Assessment Report) | 2013–2014 | “Human influence on the climate is clear” (95%+ certainty — up from “likely” in AR4); introduced carbon budget concept; 1.5°C–2°C target; ocean acidification | Scientific foundation for Paris Agreement (COP21, 2015) |
| 6 | AR6 (Sixth Assessment Report) | 2021–2023 | Human cause is “unequivocal” — strongest language yet; 1.1°C warming above pre-industrial; 1.5°C threshold likely by early 2030s; “Code Red for Humanity”; climate tipping points; loss and damage | COP26 Glasgow (2021); COP27 Loss & Damage Fund (2022); COP28 Global Stocktake (2023) |
| 7 | AR6 WGI — Physical Science Basis | Aug 2021 | Physical science of climate change — temperatures, sea level, extreme weather attribution; 1.1°C confirmed | “Code Red for Humanity” — UN Sec-Gen Guterres; triggered COP26 Glasgow (Oct 2021) |
| 8 | AR6 WGII — Impacts, Adaptation & Vulnerability | Feb 2022 | Impacts on ecosystems, food, water, human health; growing adaptation gap; loss and damage as policy concept | Loss and Damage Fund established at COP27 (Sharm el-Sheikh, 2022) |
| 9 | AR6 WGIII — Mitigation of Climate Change | Apr 2022 | Emission reduction pathways; energy transition; carbon removal; rapid action is technically feasible | Tripling renewables pledge; fossil fuel transition language at COP28 Dubai (2023) |
| 10 | AR6 SYR — Synthesis Report | Mar 2023 | Integrated summary of all three WG reports for policymakers; comprehensive climate action roadmap | Informed COP28 Global Stocktake (Dubai, Dec 2023) |
| 11 | SR1.5 — Special Report on 1.5°C | 2018 | 1.5°C vs 2°C comparison: coral reefs decline 70–90% at 1.5°C; >99% at 2°C; Arctic ice loss; water scarcity doubles at 2°C | Requested at COP21 (Paris, 2015); directly informed all COP26–28 negotiations |
| 12 | SRCCL — Climate Change & Land | 2019 | Desertification, land degradation, food security, deforestation; land as both carbon source and carbon sink | Informed REDD+ discussions; food system emissions; COP26 land use pledges |
| 13 | SROCC — Ocean and Cryosphere | 2019 | Sea level rise, ocean acidification, glacier loss, Arctic and Antarctic changes; marine ecosystem risks | Loss and damage framing; small island states; informed COP25 and COP26 negotiations |
| 14 | SRREN — Renewable Energy Sources | 2011 | Potential of renewables to reduce emissions; modelled 80%+ renewable energy by 2050 scenarios | Informed post-Cancun clean energy targets; Durban Platform negotiations |
| 15 | Special Report on CCS (Carbon Capture and Storage) | 2005 | Role of carbon capture and geological storage in mitigation; cost and technology analysis | Influenced mitigation pathway discussions under Kyoto Protocol second phase |
🔬 AR6 Structure — Three Working Groups + Synthesis Report
| Component | Working Group | Focus Area | Released | Key Phrase / Outcome |
|---|---|---|---|---|
| AR6 WGI | Working Group I: The Physical Science Basis | Temperatures, sea level, extreme weather, attribution | August 2021 | “Code Red for Humanity” — UN Sec-Gen Guterres; human warming “unequivocal”; 1.1°C confirmed |
| AR6 WGII | Working Group II: Impacts, Adaptation and Vulnerability | Ecosystems, food, water, human health, adaptation gaps | February 2022 | Loss and damage concept articulated → led to COP27 Loss and Damage Fund (2022) |
| AR6 WGIII | Working Group III: Mitigation of Climate Change | Emission pathways, energy transition, carbon removal | April 2022 | Rapid fossil fuel phase-down is technically feasible; renewable tripling scenarios → COP28 pledges |
| AR6 SYR | Synthesis Report | Integrated summary of all three WG reports for policymakers | March 2023 | Comprehensive policy roadmap for staying within 1.5°C → informed COP28 Global Stocktake |
WGI = Physical Science | WGII = Impacts & Adaptation | WGIII = Mitigation
📄 Key IPCC Special Reports
| Report | Year | Key Focus | Exam-Critical Finding |
|---|---|---|---|
| SR1.5 — Global Warming of 1.5°C | 2018 | Detailed consequences of 1.5°C vs 2°C warming | Coral reefs: 70–90% loss at 1.5°C; >99% loss at 2°C. Every fraction of a degree matters. Requested by COP21. |
| SRCCL — Climate Change and Land | 2019 | Desertification, land degradation, food security, deforestation | Land is both a carbon source (deforestation) and a carbon sink (forests, soil); food systems = major GHG source |
| SROCC — Ocean and Cryosphere | 2019 | Sea level rise, ocean acidification, glacier loss, polar changes | Ocean has absorbed 90% of excess heat; sea level rise projected even under Paris targets |
| SRREN — Renewable Energy | 2011 | Role of renewables in mitigation; technology scenarios | Modelled scenarios where 80%+ of energy supply comes from renewables by 2050 |
| Special Report on CCS | 2005 | Carbon capture and geological storage as a mitigation tool | Identified CCS as a viable option but noted cost barriers and storage permanence concerns |
🔗 IPCC Reports → COP Policy Links
| IPCC Report | Year | Linked COP / Policy Outcome |
|---|---|---|
| FAR (AR1) | 1990 | → UNFCCC signed at Earth Summit, Rio de Janeiro (1992) |
| SAR (AR2) | 1995 | → Kyoto Protocol adopted at COP3, Kyoto (1997) |
| TAR (AR3) | 2001 | → Bonn Agreement + Marrakesh Accords (COP6 bis + COP7, 2001) |
| AR4 | 2007 | → Nobel Peace Prize; Bali Action Plan (COP13, 2007) |
| AR5 | 2013–2014 | → Paris Agreement (COP21, Paris, 2015) — most direct link |
| AR6 WGI | Aug 2021 | → COP26 Glasgow — “Code Red”; Glasgow Climate Pact; India’s Panchamrit |
| AR6 WGII | Feb 2022 | → COP27 Sharm el-Sheikh — Loss and Damage Fund established |
| AR6 WGIII + SYR | Apr 2022–Mar 2023 | → COP28 Dubai — First Global Stocktake; fossil fuel transition language; tripling renewables |
| SR1.5 | 2018 | → All COP26–COP29 negotiations on 1.5°C target; Loss and Damage framing |
⚖️ Compare Two IPCC Reports
📝 Key Notes & Memory Tips
- Full name: Intergovernmental Panel on Climate Change
- Established: 1988 by UNEP + WMO
- HQ: Geneva, Switzerland
- Key fact: IPCC does NOT conduct its own research — it reviews and synthesises existing peer-reviewed science
- Three Working Groups: WGI (Physical Science) | WGII (Impacts & Adaptation) | WGIII (Mitigation)
- Nobel Peace Prize: 2007 (shared with Al Gore)
- Members: 195 countries (all UN members)
AR5 was the most policy-influential IPCC report yet. It introduced: Carbon Budget (total CO₂ humanity can emit while staying within 1.5°C or 2°C), confirmed human influence with 95%+ probability (up from “likely” in AR4), and scientifically justified why keeping warming below 1.5°C is significantly safer than 2°C. These findings directly shaped the Paris Agreement (COP21, December 2015) — committing 196 countries to hold temperature rise to “well below 2°C” and pursue efforts to limit it to 1.5°C.
- Human-caused warming is “unequivocal” — strongest language in IPCC history
- Global temperature has already risen ~1.1°C above pre-industrial levels (1850–1900)
- The 1.5°C threshold will likely be reached in the early 2030s under all emission scenarios
- UN Sec-Gen Guterres: “Code Red for Humanity” (upon AR6 WGI release, August 2021)
- Extreme weather events (heat waves, floods, droughts) now directly attributable to climate change
- AR6 WGII assessed loss and damage → directly led to COP27 Loss and Damage Fund (2022)
The IPCC Special Report on 1.5°C (October 2018) was requested by the UNFCCC at COP21. Key findings:
- Coral reefs: 70–90% decline at 1.5°C; over 99% loss at 2°C
- Arctic summer ice: lost once every 100 years at 1.5°C; once every 10 years at 2°C
- Sea level rise: 10 cm more at 2°C vs 1.5°C
- People facing water scarcity: twice as many at 2°C vs 1.5°C
- Conclusion: Every fraction of a degree matters enormously.
| Report | Year | Landmark Statement | Certainty Level |
|---|---|---|---|
| AR1 (FAR) | 1990 | GHGs increasing; warming projected | — |
| AR2 (SAR) | 1995 | “Discernible human influence” on climate | Balance of evidence |
| AR3 (TAR) | 2001 | Most warming in last 50 yrs attributable to humans | Likely |
| AR4 | 2007 | “Warming is unequivocal“ | Very likely (>90%) |
| AR5 | 2014 | “Human influence is clear“ | Extremely likely (>95%) |
| AR6 | 2021–23 | “Human cause is unequivocal” — Code Red | Unequivocal (>99%) |
AR–Policy link: “FAR-UNFCCC, SAR-Kyoto, TAR-Bonn, AR4-Nobel, AR5-Paris, AR6-Code Red”
FAR (1990) → UNFCCC (1992) | SAR (1995) → Kyoto (1997) | TAR (2001) → Bonn Agreements | AR4 (2007) → Nobel Prize | AR5 (2014) → Paris (2015) | AR6 (2021–23) → Glasgow / Dubai
IPCC’s 3 Working Groups: “Physical Impact Mitigate”
WGI = Physical Science | WGII = Impacts & Adaptation | WGIII = Mitigation
Certainty escalation: “Discernible → Likely → Very Likely → Extremely Likely → Unequivocal”
AR2 → AR3 → AR4 → AR5 → AR6
🃏 Flashcards
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🧩 Practice Quiz
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The IPCC was established in 1988 by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO). It is headquartered in Geneva, Switzerland. The IPCC does not conduct its own research — it assesses and synthesises existing peer-reviewed scientific literature on climate change, producing Assessment Reports approximately every 5–7 years.
The IPCC and former US Vice-President Al Gore jointly received the Nobel Peace Prize in 2007 for their efforts to build up and disseminate greater knowledge about man-made climate change. AR4 had declared “Warming of the climate system is unequivocal” — the first categorical statement of its kind in IPCC history. Rajendra Pachauri was IPCC Chair at the time but the Prize was awarded to the IPCC as an institution, not to him personally.
IPCC AR5 (2013–2014) provided the scientific foundation for the Paris Agreement, adopted at COP21 in Paris in December 2015. AR5 introduced the concept of a carbon budget, confirmed that human influence on the climate is “clear” with over 95% certainty, and scientifically justified the 1.5°C–2°C temperature limit. The Kyoto Protocol (1997) was based on AR2 (1995).
UN Secretary-General António Guterres coined the phrase “Code Red for Humanity” upon the release of the IPCC AR6 Working Group I Report (Physical Science Basis) in August 2021. The report declared that human-caused warming is “unequivocal” and warned that the 1.5°C threshold could be crossed in the early 2030s under all emission scenarios. It was not the Synthesis Report (2023) or the SR1.5 (2018).
The IPCC SR1.5 (2018) found that at 1.5°C of warming, coral reefs would decline by 70–90%, but at 2°C warming, more than 99% of coral reefs would be lost — effectively a functional extinction of coral reef ecosystems. This stark difference illustrates why every fraction of a degree of additional warming matters enormously for biodiversity and marine ecosystems, and is why the 1.5°C target in the Paris Agreement is considered critically important.
✅ Key Takeaways
❓ Frequently Asked Questions
The Intergovernmental Panel on Climate Change (IPCC) is a UN body established in 1988 by UNEP and WMO to provide policymakers with regular scientific assessments on climate change. Headquartered in Geneva, the IPCC does not conduct original research — it reviews and synthesises thousands of peer-reviewed scientific papers and publishes comprehensive Assessment Reports (ARs) approximately every 5–7 years. Each report is produced by three Working Groups: (1) physical science, (2) impacts and adaptation, and (3) mitigation. The IPCC has published 6 Assessment Reports to date (AR1 in 1990 through AR6 in 2021–2023). The IPCC shared the Nobel Peace Prize with Al Gore in 2007.
IPCC AR6 is the most comprehensive climate assessment ever produced. It stated with “unequivocal” certainty that human activities are the primary cause of global warming. It found that global temperature had already risen approximately 1.1°C above pre-industrial levels. It warned that the 1.5°C threshold would likely be reached in the early 2030s under all emission scenarios. AR6 WGII (February 2022) documented widening adaptation gaps and articulated loss and damage as a policy concept, directly leading to the COP27 Loss and Damage Fund (2022). AR6 WGIII outlined technically feasible mitigation pathways. The Synthesis Report (March 2023) provided an integrated roadmap for policymakers.
The Paris Agreement was adopted at COP21 in Paris in December 2015 — 196 countries committed to keeping warming to well below 2°C (preferably 1.5°C) above pre-industrial levels. It was directly shaped by IPCC AR5 (2013–2014), which established the carbon budget needed to meet these temperature limits and confirmed human causation with over 95% certainty. The Agreement also requested the IPCC to produce a special report on 1.5°C, which was published in 2018 (SR1.5) and showed that 1.5°C is significantly safer than 2°C for ecosystems and human health. Each country’s NDC (Nationally Determined Contribution) forms the operational mechanism of the Paris Agreement.
IPCC reports are tested in UPSC Prelims (Environment & Ecology, Current Affairs), SSC CGL, Banking GA, and State PSC exams. Key tested facts: IPCC’s establishment year and founding bodies (1988, UNEP + WMO), Geneva HQ, Nobel Peace Prize 2007 (with Al Gore), the six Assessment Reports and their policy links (FAR→UNFCCC, SAR→Kyoto, AR5→Paris), AR6’s “unequivocal” language and “Code Red for Humanity” phrase, the 1.5°C vs 2°C findings from SR1.5 (especially coral reef data: 70–90% vs >99% loss), the three Working Groups, and the loss and damage concept from AR6 WGII. The fact that the IPCC does NOT conduct research itself is also frequently tested.
