Here is the 2013 report, along with a summary for policymakers, from Working Group I of the International Panel on Climate Change (IPCC), which forms part of the IPCC's Fifth Assessment Report (AR5). Evidence of climate change set out in the report is based on many independent scientific analyses from observations of the climate system, paleoclimate archives, theoretical studies of climate processes and simulations using climate models. A finding of Working Group 1 is that warming of the climate system is unequivocal, and, since the 1950s, many of the observed changes are unprecedented over decades to millennia. The atmosphere and ocean have warmed,the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased. Human influence has been detected in warming of the atmosphere and the ocean, in changes in the global water cycle, in reductions in snow and ice, in global mean sea level rise, and in changes in some climate extremes. This evidence for human influence has grown since AR4. The report finds is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century.
Go to Resource: http://www.ipcc.ch/