Editing IPCC:AR6/WGI/Chapter-1 (section)

=== 1.1.2 Rationale for the New AR6 WGI Structure and Its Relation to the Previous AR5 WGI Report ===

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The AR6 WGI report, as a result of its scoping process, is structured around topics such as large-scale information, process understanding and regional information (Figure 1.1). This represents a rearrangement relative to the structure of the WGI contribution to the IPCC Fifth Assessment Report (AR5; [[#IPCC--2013a|IPCC, 2013a]] ), as summarized in Figure 1.2. The AR6 approach aims at a greater visibility of key knowledge developments that are potentially relevant for policymakers, including climate change mitigation, regional adaptation planning based on a risk management framework, and the global stocktake.

Two key subjects presented separately in AR5, paleoclimate and model evaluation, are now distributed among multiple AR6 WGI chapters. Various other cross-cutting themes are also distributed throughout this Report. A summary of these themes and their integration across chapters is described in Table 1.1.

'''Table 1.1 |''' '''Cross-cutting themes in AR6 WGI, and the main chapters that deal with them.''' Bold numbers in the table indicate the chapters that have extensive coverage.

{| class="wikitable"
|-
! '''Thematic Focus'''

! '''Main Chapters;''' Addi tional Chapters

|-
| Aerosols

| '''2, 6, 7, 8, 9, 10,''' '''11;''' 3, 4, Atlas

|-
| Atmospheric Circulation

| '''3, 4,''' '''8;''' 2, 5, 10, 11

|-
| Biosphere

| '''2, 3, 5, 11, Cross-Chapter Box''' '''5.1;''' 1, 4, 6, 8

|-
| Carbon Dioxide Removal (CDR)

| '''4, 5;''' 8

|-
| Cities and Urban Aspects

| '''10, 11, 12;''' 2, 8, 9, Atlas

|-
| Climate Services

| '''12, Atlas, Cross-Chapter''' '''Box 12.2;''' 1, 10

|-
| Climatic Impact-Drivers

| '''12, Annex VI;''' 1, 9, 10, 11, Atlas

|-
| CO <sub>2</sub> Concentration Levels

| '''1, 2, 5, Cross-Chapter Box''' '''1.1;''' 12, Atlas

|-
| Coronavirus Pandemic (COVID-19)

| '''Cross-Cha''' '''pter Box 6.1;''' 1

|-
| Cryosphere

| '''2, 3, 9;''' 1, 4, 8, 12, Atlas

|-
| Deep Uncertainty

| '''9;''' 4, 7, 8, Cross-Chapter Box 11.2, Cross-Chapter Box 12.1

|-
| Detection and Attribution

| '''3, 10, 11, Cross-Working Group Box: Attribution;''' 5, 6, 8, 9, 12, Atlas

|-
| Emergence

| '''1''' ''', 10, 12;''' 8, 11

|-
| Extremes and Abrupt Change

| '''11, 12;''' 1, 5, 7, 8, 9, 10, Atlas, Cross-Chapter Box 12.1

|-
| Global Warming Hiatus

| '''Cross-Chapter''' '''Box 3.1;''' 10, 11

|-
| Land Use

| '''5;''' 2, 7, 8, 10, 11

|-
| Limits of Habitability

| '''9, 12;''' 11

|-
| Low-Likelihood, High-Impact/High Warming

| '''1, 4, 11;''' 7, 8, 9, 10, Cross-Chapter Box 1.1, Cross-Chapter Box 1.3, Cross-Chapter Box 4

|-
| Model Evaluation

| '''1, 3, 9, 10, 11,''' '''Atlas;''' 5, 6, 8

|-
| Modes of Variability

| '''1, 2, 3, 4, 8, 9, Annex IV;''' 7, 10, 11, 12, Atlas

|-
| Monsoons

| '''8;''' 3, 4, 9, 10, 11, 12, Atlas

|-
| Natural Variability

| '''1, 2, 3, 4,''' '''9, 11;''' 5, 8, 10

|-
| Ocean

| '''3, 5, 9;''' 1, 2, 4, 7, 12, Atlas

|-
| Paleoclimate

| '''1, 2;''' 3, 5, 7, 8, 9, Atlas, Box 11.3

|-
| Polar Regions

| '''9, 12, At''' '''las;''' 2, 3, 7, 8

|-
| Radiative Forcing

| '''7;''' 1, 2, 6, 11

|-
| Regional Case Studies

| '''10, 11, Atlas;''' 12, Box 8.1, Box 11.4, Cross-Chapter Box 12.2

|-
| Risk

| '''1, 11, 12, Cross-Chapter Box 1.3;''' 4, 5, 9, Cross-Chapter Box 12.1

|-
| Sea Level

| '''9, 12;''' 1, 2, 3, 4, 7, 8, 10, 11, Atlas

|-
| Short-Lived Climate Forcers (SLCFs)

| '''6, 7;''' 1, 2, 4, Atlas

|-
| Solar Radiation Modification (SRM)

| '''4, 5;''' 6, 8

|-
| Tipping Points

| '''5, 8, 9;''' 4, 11, 12, Cross-Chapter Box 12.1

|-
| Values and Beliefs

| '''1, 10;''' 12

|-
| Volcanic Forcing

| '''2, 4, 7, 8;''' 1, 3, 5, 9, 10, Annex III

|-
| Water Cycle

| '''8, 11;''' 2, 3, 10, Box 11.1

|}

[[File:bba317ed389879a33672c9472ea68473 IPCC_AR6_WGI_Figure_1_2.png|thumb|400x300px]]

'''Figure 1.2 |''' '''Main relations between AR5 WGI and AR6 WGI chapters.''' The left-hand column shows the AR5 WGI chapter categories. The central column lists the AR5 WGI chapters, with the colour code indicating their relation to the AR6 WGI structure shown in Figure 1.1: Large-Scale Information (purple), Process Understanding (gold), Regional Information (light blue) and Whole-Report Information (dark blue). AR5 WGI chapters depicted in white have their topics distributed over multiple AR6 WGI chapters and categories. The right-hand column explains where to find related information in the AR6 WGI report.

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