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.
global warming:279
the scientific consensus as of 2013[update], as stated in the ipcc fifth assessment report, is that it "is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century".