The height of the Little Ice Age is generally dated as 1650 to 1850 A.D. The American Revolutionary Army under General George Washington shivered at Valley Forge in the winter of 1777-78, and New York harbor was frozen in the winter of 1780. Historic snowstorms struck Lisbon, Portugal in 1665, 1744 and 1886. Glaciers in Glacier National Park in Montana advanced until the late 18th or early 19th centuries. The last River Thames Frost Fair was held in 1814. The Little Ice Age phased out during the middle to late 19th century.Mt. Pinatubo's eruption in the Philippines released more so-called greenhouses gases in that one Reagan-era eruption than mankind had put into the atmosphere in his entire existence as a species. If I recall correctly, I read that at the time in the New York Times.
The Little Ice Age, following the historically warm temperatures of the Medieval Warm Period, which lasted from about AD 950 to 1250, has been attributed to natural cycles in solar activity, particularly sunspots. A period of sharply lower sunspot activity known as the Wolf Minimum began in 1280 and persisted for 70 years until 1350. That was followed by a period of even lower sunspot activity that lasted 90 years from 1460 to 1550 known as the Sporer Minimum. During the period 1645 to 1715, the low point of the Little Ice Age, the number of sunspots declined to zero for the entire time. This is known as the Maunder Minimum, named after English astronomer Walter Maunder. That was followed by the Dalton Minimum from 1790 to 1830, another period of well below normal sunspot activity.
The increase in global temperatures since the late 19th century just reflects the end of the Little Ice Age. The global temperature trends since then have followed not rising CO2 trends but the ocean temperature cycles of the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO). Every 20 to 30 years, the much colder water near the bottom of the oceans cycles up to the top, where it has a slight cooling effect on global temperatures until the sun warms that water. That warmed water then contributes to slightly warmer global temperatures, until the next churning cycle.
Those ocean temperature cycles, and the continued recovery from the Little Ice Age, are primarily why global temperatures rose from 1915 until 1945, when CO2 emissions were much lower than in recent years. The change to a cold ocean temperature cycle, primarily the PDO, is the main reason that global temperatures declined from 1945 until the late 1970s, despite the soaring CO2 emissions during that time from the postwar industrialization spreading across the globe.
The 20 to 30 year ocean temperature cycles turned back to warm from the late 1970s until the late 1990s, which is the primary reason that global temperatures warmed during this period. But that warming ended 15 years ago, and global temperatures have stopped increasing since then, if not actually cooled, even though global CO2 emissions have soared over this period. As The Economist magazine reported in March, “The world added roughly 100 billion tonnes of carbon to the atmosphere between 2000 and 2010. That is about a quarter of all the CO2 put there by humanity since 1750.” Yet, still no warming during that time. That is because the CO2 greenhouse effect is weak and marginal compared to natural causes of global temperature changes...
Britain’s Met Office, an international cheerleading headquarters for global warming hysteria, did concede last December that there would be no further warming at least through 2017, which would make 20 years with no global warming. That reflects grudging recognition of the newly developing trends. But that reflects as well growing divergence between the reality of real world temperatures and the projections of the climate models at the foundation of the global warming alarmism of the UN’s Intergovernmental Panel on Climate Change (IPCC). Since those models have never been validated, they are not science at this point, but just made up fantasies. That is why, “In the 12 years to 2011, 11 out of 12 [global temperature]forecasts [of the Met Office] were too high — and… none were colder than [resulted],” as BBC climate correspondent Paul Hudson wrote in January.
Global warming was never going to be the problem that the Lysenkoists who have brought down western science made it out to be. Human emissions of CO2 are only 4 to 5% of total global emissions, counting natural causes.
Tuesday, May 28, 2013
The Big Yellow Thing In The Sky
When the facts contradict your expectations, believe the facts. The facts tell me that we understand way too little about atmospheric science to be jumping to conclusions about Venus-style global warming (and of course the statist solutions that always accompany such conclusions):