24 Hours of Climate Reality: Gore-a-thon – Hour 1

During the last century there have been significantly fewer major volcanoes. i.e. ones with a Volcanic Explosivity Index (VEI) rated 5 or higher;
1902 – VEI6(?) – Santa Maria, Guatemala
1907 – VEI5 – Ksudach, Kamchatka
1912 – VEI6 – Novarupta (Katmai)
1932 – VEI5+ – Azul, Cerro (Quizapu)
1956 – VEI5 – Bezymianny, Kamchatchka
1980 – VEI5 – St Helens, US
1982 – VEI5 – El Chichon, Mexico
1991 – VEI6 – Pinatubo, Philippines
as compared to a period such 1580 – 1680;
1580 ± 20 – VEI6 – Billy Mitchell
1586 – VEI5? – Kelut, Java
1593 – VEI5? – Raung, Java
1600 – VEI6 – Huaynaputina
1625 – VEI5 – Katla
1640 – VEI5 – Komaga-Take, Japan
1641 – VEI6 – Mount Parker
1650 – VEI6 – Kolumbo, Santorini
1660 – VEI6 – Long Island (Papua New Guinea)
1663 – VEI5 – Usu, Japan
1667 – VEI5 – Shikotsu (Tarumai), Japan
1673 – VEI5? – Gamkonora, Halmahera
1680 – VEI5? – Tongkoko, Sulaw
which coincides with the depths of the Little Ice Age:
http://www.eh-resources.org/timeline/timeline_lia.html
http://en.wikipedia.org/wiki/Little_Ice_Age
The effects of volcanoes on Earth’s climate are well know, e.g. “the 1991 explosion of Mount Pinatubo, a stratovolcano in the Philippines, cooled global temperatures for about 2–3 years.
In 1883, the explosion of Krakatoa (Krakatau) created volcanic winter-like conditions. The next four years after the explosion were unusually cold, and the winter of 1887 to 1888 included powerful blizzards.Record snowfalls were recorded worldwide.
The 1815 eruption of Mount Tambora, a stratovolcano in Indonesia, occasioned mid-summer frosts in New York State and June snowfalls in New England and Newfoundland and Labrador in what came to be known as the “Year Without a Summer” of 1816.
A paper written by Benjamin Franklin in 1783 blamed the unusually cool summer of 1783 on volcanic dust coming from Iceland, where the eruption of Laki volcano had released enormous amounts of sulfur dioxide, resulting in the death of much of the island’s livestock and a catastrophic famine which killed a quarter of the population. Temperatures in the northern hemisphere dropped by about 1 °C in the year following the Laki eruption.
In 1600, the Huaynaputina in Peru erupted. Tree ring studies show that 1601 was cold. Russia had its worst famine in 1601 to 1603. From 1600 to 1602, Switzerland, Latvia and Estonia had exceptionally cold winters. The wine harvest was late in 1601 in France, and in Peru and Germany wine production collapsed. Peach trees bloomed late in China, and Lake Suwa in Japan froze early.[4]
In 1452 or 1453, a cataclysmic eruption of the submarine volcano Kuwae caused worldwide disruptions.
The Great Famine of 1315–1317 in Europe may have been precipitated by a volcanic event,[5] perhaps that of Kaharoa, New Zealand, which lasted about five years.[6]
The extreme weather events of 535–536 are most likely linked to a volcanic eruption.”
http://en.wikipedia.org/wiki/Volcanic_winter
Thus a portion of the warming that occurred during last century is likely due to lower levels of volcanic activity, versus increases in CO2 emissions. Does this make me a denier?…