Around 1.2 million years ago, a shift in global climate began that caused a change in the timing of the alternating warm and cold periods—called interglacials and glacials—that have persisted during the Pleistocene Ice Age. Prior to that time, ice age glacial periods lasted about 40,000 years but since ~700,000 years ago ice-age cycles have lasted for around 100,000 years. Orbital variations, called the Croll-Milankovitch cycles, do exert some forcing on the 100,000 year time scale, but it is relatively weak. Orbital cycles seem to many too feeble an explanation for the change in glacial-interglacial timing. Some scientists have attempted to attribute the timing shift to a drop in CO2 but a new study confirms that carbon dioxide levels were not the cause of the climate shift.
The lingering cool temperatures being experience by much of North America has weather forecasters wondering if we are entering a new Little Ice Age—a reference to the prolonged period of cold weather that afflicted the world for centuries and didn't end until just prior to the American Civil War. From historical records, scientists have found a strong correlation between low sunspot activity and a cooling climate. At the end of May, an international panel of experts led by NOAA and sponsored by NASA released a new prediction for the next solar cycle: Solar Cycle 24 will be one of the weakest in recent memory. Are we about to start a new Little Ice Age?
Among the many catastrophes that are to befall our world due to global warming, the imminent demise of coral reefs is one of the worst. According to climate change proponents, as waters warm the ocean's reefs will bleach out and die, leaving the seas aquatic deserts, devoid of life. Now comes news that scientists have discovered live, healthy corals on reefs already as hot as the oceans are supposed to get 100 years from now, according to IPCC predictions. Looks like the corals didn't read the IPCC reports.
In a new report in Science, scientists present results matching neither the hypothesis of inter-hemispheric synchrony during the mid to late Holocene nor rhythmic asynchrony, downplaying the importance of global driving mechanisms. It seems that several glacier advances occurred in New Zealand during classic northern warm periods. Understanding the relationship between climate changes in the northern and southern hemispheres during the Holocene, along with their causes, remains a major problem of climate science.
Increased scrutiny of climate catastrophists' claims is leading to panic among the promoters of global warming hype. Rather than attempting to counter mounting evidence that global warming—at least as defined by the IPCC and its supporters—is not a valid scientific theory, a number of leading catastrophists have issued a public call to climate scientists. Their plea? Further dumbing down climate science by using a simplified “common climate language” to “advance the public's decision-making capacity.”
The current hot phrase bandied about by talking heads and parotted by news pundits is “tipping point.” We are told that the climate may be near a tipping point, if it has not crossed one already, and that can't be good. But what is a tipping point, where do they come from and how can we identify one when we see it?
One of the catastrophic results of global warming always cited by climate change alarmists is the melting of the ice sheets covering Greenland. Some even speculated that global warming had pushed Greenland past a “tipping point” into a scary new regime of wildly heightened ice loss and rapidly rising in sea levels. Now, from the fall meeting of the American Geophysical Union, comes word that Greenland's Ice Armageddon has been called off.
There have been a number of near hysterical reports that the Greenland and Antarctic ice sheets are melting much faster than anticipated. This has been trumpeted as prima facia evidence that Global Warming is accelerating and we will soon see marked increases in sea levels world wide. The surging glaciers from both the Greenland and West Antarctic ice sheets have alarmed scientists, eco-advocates and the news media alike. However, two new studies point to random, wind-induced circulation changes in the ocean—not global warming—as the primary cause of the recent glacial ice losses.