"Overwhelming" evidence

The Longmont Times-Call

During a later panel discussion, students asked White and three other scientists what evidence supports the theory that human activity is causing climate change.

When Steven Brown, an atmospheric chemist at the National Oceanic and Atmospheric Administration, experiments with model climates, he doesn’t see global warming, to the extent scientists have observed, without human forces such as carbon dioxide emission and increased use of fertilizers, he said.

Mark Serreze, senior research scientist at the National Snow and Ice Data Center, said, “Climate doesn’t change all by itself. ... Something has to force it.”

And greenhouse gases seem to be the force behind current changes in the climate, he added.

And Serreze has no doubt that global warming is occurring.

“The evidence from so many sources is so overwhelming ... we just can’t ignore it anymore,” he said.

That evidence includes the increasing average temperature of the globe; melting glaciers and ice caps worldwide; increasingly warmer oceans; rising sea levels; and shrubs growing on land that once was tundra.

Check out this 1993 paper--with Mark Serreze's name on it : Absence of evidence for greenhouse warming over the Arctic Ocean in the past 40 years

In particular, we do not observe the large surface warming trends predicted by models; indeed, we detect significant surface cooling trends over the western Arctic Ocean during winter and autumn. This discrepancy suggests that present climate models do not adequately incorporate the physical processes that affect the polar regions.