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Source: IPCC TAR TS of WG1 

Table 1: Estimates of confidence in observed and projected changes in extreme weather and climate events. The table depicts an assessment of confidence in observed changes in extremes of weather and climate during the latter half of the 20th century (left column) and in projected changes during the 21st century (right column)^a. This assessment relies on observational and modelling studies, as well as physical plausibility of future projections across all commonly used scenarios and is based on expert judgement (see Footnote 4 ). [Based upon Table 9.6 ]

Confidence in observed changes (latter half of the 20th century)	Changes in Phenomenon	Confidence in projected changes (during the 21st century)
Likely	Higher maximum temperatures and more hot days over nearly all land areas	Very likely
Very likely	Higher minimum temperatures, fewer cold days and frost days over nearly all land areas	Very likely
Very likely	Reduced diurnal temperature range over most land areas	Very likely
Likely, over many areas	Increase of heat index 12 over land areas	Very likely, over most areas
Likely, over many Northern Hemisphere mid- to high latitude land areas	More intense precipitation eventsb	Very likely, over most areas
Likely, in a few areas	Increased summer continental drying and associated risk of drought	Likely, over most mid-latitude continental interiors (Lack of consistent projections in other areas)
Not observed in the few analyses available	Increase in tropical cyclone peak wind intensitiesc	Likely, over some areas
Insufficient data for assessment	Increase in tropical cyclone mean and peak precipitation intensitiesc	Likely, over some areas

a For more details see Chapter 2 (observations) and Chapters 9, 10 (projections).

b For other areas there are either insufficient data or conflicting analyses.

c Past and future changes in tropical cyclone location and frequency are uncertain.

Source: IPCC TAR TS of WG1 

Climate Change 2001 Assessment

Adaptive Capacity, Vulnerability, and Key Concerns by Region

Facts on environmental matters

Table SPM.1 Estimates of potential global greenhouse gas emission reductions in 2010 and in 2020

The Emissions Scenarios from the Special Report on Emissions Scenarios (SRES)

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Other views on Climate Change

Footnotes for the Summary for Policymakers of IPCC Working Group III

Footnotes for Table 1 of IPCC SPM WG II

Footnotes for the Summary for Policymakers of IPCC Working Group 1

Footnotes for the Summary for Policymakers of IPCC Working Group II

Variations of the Earth's surface temperature for :

Indicators of the human influence on the atmosphere during the Industrial Era

The global mean radiative forcing of the climate system for the year 2000, relative to 1750

Simulated annual global mean surface temperatures

The global climate of the 21st Century

Documented Climate Change Impacts

Figure SPM-2 - Reasons for Concern

Figure SPM-3 - Projected Changes in Annual Runoff

Carbon in Oil, Gas and Coal Reserves Compared with Historic Fossil Fuel Carbon Emissions (in gigatonnes)

Footnotes to Table SPM-1 (Question 6.2.2)

Figure 8.1 Precipitation

Figure 8.2 Hurricanes

Schematic of observed variations of the temperature indicators / the hydrological and storm-related indicators

Many external factors force climate change

The annual mean change of the temperature (colour shading) and its range (isolines)

Analysis of inter-model consistency in regional relative warming

GCRIO

UNFCCC

Pew Climate

NCDC

Climate Ark

Climatic Research Unit

CICERO

World Business Council for Sustainable Development

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