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Summary for Policymakers<br />

impacts in the latter decades of the 21st century and beyond. Benefits from adaptation can already be realized in addressing<br />

current risks, and can be realized in the future for addressing emerging risks. {3.2,4.5}<br />

Five Reasons For Concern (RFCs) aggregate climate change risks and illustrate the implications of warming and of adaptation<br />

limits for people, economies and ecosystems a<strong>cross</strong> sectors and regions. The five RFCs are associated with: (1) Unique and<br />

threatened systems, (2) Extreme weather events, (3) Distribution of impacts, (4) Global aggregate impacts, and (5) Largescale<br />

singular events. In this report, the RFCs provide information relevant to Article 2 of UNFCCC. (Box2.4}<br />

Without additional mitigation efforts beyond those in place today, and even with adaptation, warming by the end of the<br />

21st century will lead to high to very high risk of severe, widespread and irreversible impacts globally {high confidence)<br />

(Figure SPM.IO). In most scenarios without additional mitigation efforts (those with 2100 atmospheric concentrations<br />

(a) Risks from climate change...<br />

(b) ...depend on cumulative CO emissions...<br />

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cz ra o<br />

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-t-"<br />

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580-720,<br />

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720-1000<br />

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• - : \<br />

430-480<br />

530-580<br />

-- 1<br />

observed 2000s<br />

^ ^

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