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Reasons for concern

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The Intergovernmental Panel on Climate Change (IPCC) has organized many of the risks of climate change into five "reasons for concern." The reasons for concern show that these risks increase with increases in the Earth's global mean temperature. The IPCC's five reasons for concern are: threats to endangered species and unique systems, damages from extreme climate events, effects that fall most heavily on developing countries and the poor within countries, global aggregate impacts, and large-scale high-impact events. The five reasons for concern are described in more detail below. The following descriptions are based on information from the IPCC's Third (TAR) and Fourth Assessment Reports (AR4), published in 2001 and 2007, respectively.
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    • Unique and threatened systems 

    • Frequency and severity of extreme climate events 

    • Total economic and ecological impact 

    • "Burning embers" diagram