: Climate Change 2013: The Physical Science Basis (Working Group I Contribution to the Fifth Assessment Report).

: The report states that warming of the climate system is certain, with many observed changes being unprecedented over decades to millennia.

UN Languages * English. Download (49.8 MB) * Arabic. Download (35.0 MB) * Chinese. Download (49.1 MB) * French. Download (34.1 MB) Intergovernmental Panel on Climate Change