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How?
the sun goes through various cycles and has shown that in dormant cycles of the sun, no matter whats happening on earth the global temperature cools down. when the solar cycle is very active, it warms the global temperature. its pretty much that simple really.
just a few weeks ago there was a massive solar flare that was one of the strongest ever recorded since we were able to record solar flares and sun spots. it registered x17.
how does underwater volcanic activity warm the earth? well the earths heat is transferred throughout the world really by ocean current. when the ocean warms the earth is going to warm.
Scientists Discover Undersea Volcano Off Antarctica
31 May 2004 Scientists have found what they believe is an active and
previously unknown volcano on the sea bottom off the Antarctic Peninsula .
The international science team from the United States and Canada mapped
andsampled the ocean floor and collected video and data that indicate a major
volcano exists on the Antarctic continental shelf.
Eugene Domack, the expedition's chief scientist, said the volcano stands
700 meters (2300 feet) above the seafloor and extends to within roughly
275 meters (900 feet) of the ocean surface in an area known as Antarctic
Sound, at the northernmost tip of Antarctica .
He noted that there has been "no previous scientific record of active
volcanoes in the region. The volcano is unusual, Domack said, in that it
exists on the continental shelf, in the vicinity of a deep trough carved out
by glaciers passing across the seafloor.
In addition to mapping, the research team used a bottom-scanning video
recorder, rock dredges, and temperature probes to survey the sides and
crest of the submarine peak. The video survey revealed a surface that is
heavily colonized by bottom-dwelling organisms.
But a dark mat of underwater life broken along the edges of the volcano
by barren patches of dark, black rock indicate that lava has recently flowed
there.
Source9 Jan 06 The plateau is located in the Mid Ridge in the Indian Ocean about 500 miles east of Mauritius, said Professor Tamaki Ura, director of the University of Tokyo's Underwater Technology Research Center.
This is presumed to be not only the biggest lava plateau in the Indian Ocean but also one of the biggest in the world," Ura said. Their submersible vehicle "also spotted hydrothermal eruptions on the northern part." (In other words, its volcanically active!)
Measuring about 8.8 miles by 1.7 miles at a depth of about 8,860 feet, the plateau is covered with lava some 980 feet thick.
SourceHow Global Warming Could Cause The Next Ice Age
While global warming is being officially ignored by the political arm of the Bush administration, and Al Gore's recent conference on the topic during one of the coldest days of recent years provided joke fodder for conservative talk show hosts, the citizens of Europe and the Pentagon are taking a new look at the greatest danger such climate change could produce for the northern hemisphere - a sudden shift into a new ice age. What they're finding is not at all comforting.
In quick summary, if enough cold, fresh water coming from the melting polar ice caps and the melting glaciers of Greenland flows into the northern Atlantic, it will shut down the Gulf Stream, which keeps Europe and northeastern North America warm. The worst-case scenario would be a full-blown return of the last ice age - in a period as short as 2 to 3 years from its onset - and the mid-case scenario would be a period like the little ice age" of a few centuries ago that disrupted worldwide weather patterns leading to extremely harsh winters, droughts, worldwide desertification, crop failures, and wars around the world. Here's how it works.
Source (for the rest of the atricle. too long to post)
Mars Melt Hints at Solar, Not Human, Cause for Warming, Scientist Says
Abdussamatov believes that changes in the sun's heat output can account for almost all the climate changes we see on both planets.
Mars and Earth, for instance, have experienced periodic ice ages throughout their histories.
"Man-made greenhouse warming has made a small contribution to the warming seen on Earth in recent years, but it cannot compete with the increase in solar irradiance," Abdussamatov said
Source1992, when Mt Pinatabu erupted it colled the earth dumping millions and millions of volcanic ash into the atmosphere and it actually cooled the earth.
Stromboli of the coast of siciliy just blew its top a few days ago and is still sumping vapor, aerosols, Co2 etc. into the atmostphere.