the ipcc (2013), usgcrp (2017), and usgcrp (2018) indicate that it is extremely likely that human influence has been the dominant cause of the observed warming since the mid-twentieth century.
the ipcc (2013), usgcrp (2017), and usgcrp (2018) indicate that it is extremely likely that human influence has been the dominant cause of the observed warming since the mid-twentieth century.
intergovernmental panel on climate change:127
since the mid-20th century, most of the observed warming is "likely" (greater than 66% probability, based on expert judgement) due to human activities.