This is some of the writing that was dropped from the report under political pressure as Teapotty posted about above.
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http://cryptome.org/2014/04/ipcc-draft-14-0421.pdfRisks for warming between about 2°C and 4°C above pre-industrialRisks increase with temperature and become high for all Reasons for Concern by 4°C warming above preindustrial levels (Figure 3.4).-Many species and systems with limited adaptive capacity are subject to very high risks with
additional warming of 2°C, particularly Arctic sea-ice and coral-reef systems (RFC 1).
-Many species will be unable to track suitable climates under mid- and high-range rates of change
(RCP 4.5 and higher) and those that cannot adapt sufficiently fast will decrease in abundance or go extinct in part or all of their ranges. For medium- to high-emission scenarios (RCP 4.5 and higher), ocean acidification, together with decreasing oxygen levels and other drivers, poses substantial risks to marine ecosystems. A large fraction of terrestrial, freshwater, and marine species face increasing extinctions risk under projected climate change during and beyond the 21st century (RFC 1, 4).{WGII SPM.B1}
Extensive biodiversity loss with associated loss of ecosystem goods and services results in aggregate risks becoming high by 4°C warming (RFC 1, 4)-Climate change is projected to reduce renewable surface water and groundwater resources significantly in most dry subtropical regions (Topic 2.5.2).
-Aggregate economic damages accelerate with increasing temperature but few quantitative estimates have been completed for additional warming around 3°C or above (RFC 4).
-Risks from large-scale singular events increase disproportionately around ~2°C and become high
above 3°C, due to the potential for a large and irreversible sea-level rise from ice sheet loss. {RFC 5,WGII SPM B-1}
Global surface temperature change for the end of the 21st century is more likely than not to exceed 2°C for RCP4.5, and likely to exceed 2°C for RCP6.0 and RCP8.5. It is about as likely as not to exceed 4°C for RCP8.5. Such scenarios require slower emission cuts than the scenarios likely to avoid a warming above 2°C, but all scenarios that limit climate change require substantial and sustained reductions in greenhouse gas emissions (Topic 3.2). {WGI SPM}
Risks from warming above 4°C compared to pre-industrialAbove 4°C warming compared to preindustrial levels, as projected by RCP8.5, risks from climate
change are high to very high in all reasons for concerns and include substantial species extinction,
large risks to global and regional food security,
and the combination of high temperature and
humidity compromising normal human activities in some areas for parts of the year (Figure 3.4) All
aspects of food security are potentially affected by climate change including food access, utilization, and price stability (RFC 3). {WGII SPM B2}
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I am sure that this isn't really important information to include in the report. . .