A brief look at how language on climate change has evolved, gradually showing
that man-made factors are to blame:
"Most of the observed increase in globally averaged temperatures since the
mid-20th century is very likely due to the observed increase in anthropogenic
greenhouse gas concentrations ... The observed widespread warming of the
atmosphere and ocean, together with ice mass loss, support the conclusion that
it is extremely unlikely that global climate change of the past fifty years can
be explained without external forcing, and very likely that it is not due to
known natural causes alone." - Report of Working Group 1, IPCC Fourth Assessment
Report, released Friday, Feb. 2, 2007.
"There is new and stronger evidence that most of the warming observed over the
last 50 years is attributable to human activities." - Report of Working Group 1,
IPCC Third Assessment Report, ...