---
id: kb-2026-00338
title: Climate Change
schema_type: TechArticle
category: science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
completeness: 0.82
atomic_facts:
  - id: fact-science-climate-change-01
    statement: "The IPCC AR6 Synthesis Report headline statements say human activities, principally through greenhouse gas emissions, have unequivocally caused global warming."
    source_title: IPCC AR6 Synthesis Report Headline Statements
    source_url: https://www.ipcc.ch/report/ar6/syr/resources/spm-headline-statements/
    confidence: medium
  - id: fact-science-climate-change-02
    statement: "The same IPCC headline statements say human-caused climate change is already affecting many weather and climate extremes in every region across the globe."
    source_title: IPCC AR6 Synthesis Report Headline Statements
    source_url: https://www.ipcc.ch/report/ar6/syr/resources/spm-headline-statements/
    confidence: medium
  - id: fact-science-climate-change-03
    statement: "The IPCC AR6 Synthesis Report is the 2023 synthesis report for the Sixth Assessment Report cycle."
    source_title: IPCC Sixth Assessment Report (AR6) Synthesis Report
    source_url: https://www.ipcc.ch/report/ar6/syr/
    confidence: medium
known_gaps:
  - "This article summarizes IPCC headline findings and does not replace the full assessment reports or regional climate risk assessments."
  - "More recent observations and national inventories may update specific annual values after the AR6 synthesis cycle."
disputed_statements: []
primary_sources:
  - title: IPCC AR6 Synthesis Report Headline Statements
    type: government_report
    year: 2023
    url: https://www.ipcc.ch/report/ar6/syr/resources/spm-headline-statements/
    institution: IPCC
  - title: IPCC Sixth Assessment Report (AR6) Synthesis Report
    type: government_report
    year: 2023
    url: https://www.ipcc.ch/report/ar6/syr/
    institution: IPCC
secondary_sources: []
updated: '2026-05-28'
---

## TL;DR

Climate change is the long-term shift in climate conditions driven in the modern era primarily by human greenhouse gas emissions. The public claims in this article are limited to IPCC AR6 synthesis materials: human activities have caused global warming, observed impacts are already widespread, and the 2023 synthesis report summarizes the Sixth Assessment Report cycle.

## Core Explanation

Greenhouse gases such as carbon dioxide and methane trap heat in the Earth system. The IPCC AR6 synthesis materials describe current global warming as human-caused and connect it to observed changes in weather and climate extremes across regions.

The practical significance is that climate change is not just a future projection. It is already visible in observed hazards and impacts, while future risk depends strongly on emissions pathways, adaptation choices, and how quickly warming is limited.

This concise article avoids unsupported numeric updates and points readers to the IPCC source material for detailed regional findings, uncertainty ranges, and scenario analysis.

## Further Reading

- [IPCC AR6 Synthesis Report Headline Statements](https://www.ipcc.ch/report/ar6/syr/resources/spm-headline-statements/)
- [IPCC Sixth Assessment Report (AR6) Synthesis Report](https://www.ipcc.ch/report/ar6/syr/)

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- [AI for Climate Science: Weather Prediction and Earth System Modeling](../../ai/ai-for-climate-science.md)