Did the "Little Ice Age" really exist? November 24, 2013.
For nearly a century, scholars have gradually reconstructed the existence of a so-called “Little Ice Age.” Their research is ongoing, but most now believe that average global temperatures declined by about 1°C between the thirteenth and the twelfth centuries. The extent, meteorological consequences, and timetable of cooling varied from region to region, but sorting through these statistical complexities still yields a clear downward trend in planetary temperatures. More
Study provides new context for recent Arctic warming. October 27, 2013.
At the beginning of the Holocene roughly 10,000 years ago, 9% more sunlight reached the Northern Hemisphere than today. Very gradually, less solar radiation warmed the far north, and regional temperatures started a lengthy decline. However, at the turn of the twentieth century that trend reversed sharply, and warming has accelerated since the 1970s. Recently published in the journal Geophysical Research Letters, a University of Colorado Boulder study by lead author Gifford Miller applies radiocarbon dating to new sources in a quest for more accurate reconstructions of these climatic shifts. More
Understanding the Fifth IPCC Assessment Report. September 27, 2013.
Established in 1988 by the UN and the World Meteorological Organization, the Intergovernmental Panel on Climate Change (IPCC) is a scientific body that periodically summarizes the scholarly understanding of the world’s climate. In 2007, the panel’s fourth assessment report outlined in stark terms the likelihood of anthropogenic global warming. Since then, severe storms and drought have ravaged North America, Australia and Africa, yet unusually wet, cold conditions have accompanied some European winters. Through it all carbon emissions have continued to rise, now driven largely by developing nations. Today, the IPCC’s highly anticipated summary for policymakers was finally released, in lieu of its fifth assessment report that will be published later this year.
Best of the Web: November 2013