Excerpts from Books and Wikipedia
"The April 2014 Intergovernmental Panel on Climate Change report from the world’s leading scientists and governments reviewing the scientific literature on climate change mitigation (greenhouse gas reduction) explained, 'Baseline scenarios, those without additional mitigation, result in global mean surface temperature increases in 2100 from 3.7°C to 4.8°C compared to pre-industrial levels.' Furthermore, in the baseline scenario, the world continues to warm after 2100. The fact that we are headed toward 4°C (7°F) warming or more has been clear for more than a decade in the scientific literature." [Romm, p. 78]