Situation Report

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The idea that Global Warming is a natural cycle is well understood from paleo data covering the past 1 million years. Is there a difference between current climate, and the natural cycle? For the past million years the natural climate has oscillated between warm periods and ice ages. This shifting in and out of warm periods and ice ages is correlated strongly with Milankovitch cycles. In order to understand the difference between natural cycle and human-caused global warming, one needs to consider changes in radiative forcing and how this affects systems on earth such as the atmosphere, vegetation, ice and snow, ocean cycles and related effects. The current radiative forcing levels are clearly outside of the natural cycle range.

Is global warming a natural cycle? Or is global warming affected by human influence? What does the science say? Both are true. In the natural cycle, the world can warm, and cool, without any human interference. For the past million years this has occurred over and over again at approximately 100,000 year intervals. About 80-90,000 years of ice age with about 10-20,000 years of warm period, give or take some thousands of years.

Although the Amundsen Sea region is only a fraction of the whole West Antarctic Ice Sheet, the region contains enough ice to raise global sea levels by 4 feet (1.2 meters).  Image Credit: NASA/GSFC/SVS

(CNN) -- New research shows a major section of west Antarctica's ice sheet will completely melt in coming centuries and probably raise sea levels higher than previously predicted, revealing another impact from the world's changing climate.

According to a study released Monday, warm ocean currents and geographic peculiarities have helped kick off a chain reaction at the Amundsen Sea-area glaciers, melting them faster than previously realized and pushing them "past the point of no return," NASA glaciologist Eric Rignot told reporters.

The glacial retreat there "appears unstoppable," said Rignot, lead author of a joint NASA-University of California Irvine paper that used 40 years of satellite data and aircraft studies.

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Health workers vaccinate a child in Afghanistan. Credit Diego Ibarra Sanchez for The New York Times

nytimes.com - by Donald G. McNeil Jr. - May 5, 2014

Alarmed by the spread of polio to several fragile countries, the World Health Organization declared a global health emergency on Monday for only the second time since regulations permitting it to do so were adopted in 2007.

Just two years ago — after a 25-year campaign that vaccinated billions of children — the paralyzing virus was near eradication; now health officials say that goal could evaporate if swift action is not taken. . .

. . . “Things are going in the wrong direction and have to get back on track before something terrible happens,” said Gregory Hartl, a W.H.O. spokesman.

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