when all forcings are combined, they show good correlation to global temperature throughout the 20th century including the mid-century cooling period.
when all forcings are combined, they show good correlation to global temperature throughout the 20th century including the mid-century cooling period.
global warming:452
ipcc ar4 wg1 ch9 2007, p. 690: "recent estimates indicate a relatively small combined effect of natural forcings on the global mean temperature evolution of the second half of the 20th century, with a small net cooling from the combined effects of solar and volcanic forcings."