|
(IPCC) Scientific Body formed by U.N.
Disagree
Human activities cause significant changes in long-lived gases, ozone, water vapour, surface albedo, aerosols and contrails. ... Positive forcings lead to warming of climate and negative forcings lead to a cooling. ... [The net effect is positive].
Climatology Professor
Disagree
The small number of credible skeptics out there (e.g., Spencer, Lindzen) have spent much of the last decade searching for a negative feedback in our climate system. ... Most climate scientists, however, are reasonably certain that a negative feedback big enough to overwhelm the well-known positive feedbacks in the climate system [...] does not exist. ... it is extremely difficult to reconcile the existence of a big negative feedback with our past observations of climate variability.
|