Widespread impacts attributed to climate change based on the available scientific literature since the AR4 .
1 IPCC Fifth Assessment Synthesis Report, First Order Draft, under 2.5.2 Water, Food and urban systems, human health, security and livelihoods, SYR-65
https://www.ipcc.ch/pdf/assessment-report/ar5/syr/drafts/SYR_FOD_Topic2.pdf