© Yann Arthus-Bertrand / Altitude

Thomas Stocker & Qin Dahe

Co-Chairs IPCC Working Group I

Switzerland and China

Science-Policy Interface Seminar:

Key Messages from WGI

Human influence on the climate system is clear.

Continued GHG emissions will cause further warming and

amplify existing risks.

Changes in climate have caused impacts in natural

and human systems.

Multiple pathways exist to likely

limit warming to below 2°C.

Warming of the climate systemis unequivocal

IPC

C 2

013,

Fig

. SP

M.1

b

Temperature Difference 1901 to 2012 based on trend (°C)

Warming of the climate systemis unequivocal

IPC

C 2

013,

Fig

. SP

M.2

Precipitation Difference 1951 to 2010 based on trend (mm/yr per decade)

Warming of the climate systemis unequivocal

IPC

C 2

013,

Fig

. SP

M.2

Precipitation Difference 1951 to 2010 based on trend (mm/yr per decade)

IPC

C 2

013,

Fig

. SP

M.7

a

Global mean surface temperature change from 1986-2005

Continued emissions will cause further warming and

changes in all components of the climate system.

RCP 2.6 (annual) RCP 8.5 (annual)

IPCC 2013: Atlas of Global and Regional Climate Projections

Changes in East Africa (2081-2100)

2016-2035

2046-2065

2081-2100

2016-2035

2046-2065

2081-2100

IPC

C 2

012,

Fig

. SP

M.4

A

A 1-in-20 year hottest day is likely to become a

1-in-2 year event by the end of the 21st century

10 more frequent

2°C world

4.5°C world2°C world

Today we have a choice.

© Yann Arthus-Bertrand / Altitude

www.climatechange2013.org

www.ipcc.ch

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