World View of Global Warming

Meteorologist Scott Chambers of the University of Alaska installs a radiometer on a 50-foot meteorological tower above a black spruce forest near Fairbanks in May 1999. The boreal forest is the most extensive and possibly least studied of the world's forests, and is thought to be especially susceptible to climate change. Scientists suspect that regional tree lines will move north, forests will dry and burn more often, and insects will proliferate in a warmer climate.

Nearly 4 million acres of mature white spruce forest on the Kenai Peninsula have been killed by a growing population of spruce bark beetles (Dendroctonus rufipennis) since about 1987. This is a very active event, mediated by climate change, which has spread to about 38 million mature spruce. Scientists, including Dr. Edward Berg and Dr. Kenneth Raffa, attribute the beetle infestation to rising average temperatures in South-Central Alaska in both winter and summer. More beetle larvae can survive, and higher summer temperatures allow the insects to mature faster and complete a two-year life cyle in one year. The trees, which previously lived in balance with the beetles, do not have enough natural defenses against this assault.

New growth of black spruce on a hillside in Denali National Park headquarters, where botanist Glenn Juday has found that forest cover has advanced in elevation at the highest elevations over the last century. This is consistent with the hypothesis that forest area has increased during a 150-year warming trend. Average temperature at Denali park headquarters is 1.3° C warmer just since 1976. Other studies reported by the IPCC show that across the Arctic, boreal forests are expanding north at a rate equal to about 100 - 150 km per degree centigrade of average temperature increase.

Alaska's permafrost is also affected by climate change. See Glacier section, next.

"Sez who?":  Reference 4

Each of the foregoing photos reports on documented science, peer-reviewed published studies and scientific literature surveys. Those references are listed later in this Web site, along with climate change data, World View of Global Warming project advisors, and links to some sources of climate information.

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