IPCC30 January 2014: The Intergovernmental Panel on Climate Change (IPCC) released the full and finalized report of Working Group I's contribution to the Fifth Assessment Report (AR5), titled ‘Climate Change 2013: The Physical Science Basis.' The report concludes that: warming of the climate system is unequivocal; human influence on the climate system has been the dominant cause; limiting climate change will require substantial and sustained emission reductions; and atmospheric greenhouse gas (GHG) concentrations, already at levels not observed in at least 800,000 years, will persist for centuries to come.