Climate Disaster (catastrophe climatique)
It will not come without warning though we cannot know exactly when a great climate change is triggered so drastically unlike the current so-called global warming.
For example till the Magnitude-9.0 earthquake occurred in Japan this March, a big earthquake occurred in Haiti in 2010, other one also occurred in China in 2008, and an M9.1 earthquake occurred in Sumatra with huge tsunamis in 2004. So, the Fukushima Daiichi nuclear accident triggered by a 15-meter high tsunami caused by the M9.0 had a series of warning in preceding years.
The present instability of the global climate might be a premonition of a great climate change, such as coming of a mini glacial age.
SECTION I: Winter by Volcano
A very cold climate covered the whole earth 74,000 years ago, posing a threat to ancestors of mankind.
It was triggered by a big eruption of a great volcano in Indonesia.
The Toba supereruption (Youngest Toba Tuff or simply YTT[1]) was asupervolcanic eruption that occurred some time between 69,000 and 77,000 years ago at Lake Toba (Sumatra,Indonesia). It is recognized as one of the Earth's largest known eruptions. The related catastrophe theoryholds that this event plunged the planet into a 6-to-10-year volcanic winter and possibly an additional 1,000-year cooling episode. This change in temperature resulted in the world's human population being reduced to 10,000 or even a mere 1,000 breeding pairs, creating a bottleneck in human evolution.
http://en.wikipedia.org/wiki/Toba_catastrophe_theory
The result of the Toba eruption
As a result of the Toba eruption is very destructive. Bill Rose, a volcano expert at Michigan Tech University, is particularly interested in fine ash produced by volcanoes. The rain of ash particles from the sky is so small that they can enter the animal’s throat. “It was like he was smoking,” he said.
“Birds of birds die first,” said Rose. “Fur coat they will be filled with ash and unable to move. Then the larger animals will begin to die. ”
result of the Toba eruption, many people who died, said Stanley H. Ambrose of the University of Illinois at Urbana-Champaign. In fact, various studies of mitochondrial DNA in humans point to the possibility of genetic inhibition occurred roughly at the same time by the Toba eruption, although it is not possible to prove that regard.
But even so, Ambrose believes that human behavior shows the changes after the Toba eruption. Prior to the Toba eruption, it is difficult to get evidence that humans have done long-distance networks. After that, people in Kenya, about 4,000 miles (6400 kilometers) from the Toba eruption, seems already traveled as far as 200 miles (300 kilometers) carrying goods made of stone smoothed. Ambrose theory is that humans who want to learn to work together and want to give the prize will be better able to withstand the crisis other than those who live in isolated groups and did not want to practice the attitude of giving and sacrifice for the happiness of others.
So to say give the gift will save the world, a cover that gives hope from the story of this Toba eruption.
Quoted from National Geographic Magazine Toba eruption.
(Click to enlarge.)
http://visitourindonesia.com/toba-eruption/Even when Mount Tambora erupted in Indonesia in 1815, the global climate was severely influenced. The next year 1816 is said to have been the Year without a Summer. Ash discharged from the eruption long floated in the air to shield the surface of the earth from the sun rays. "1816 was the second coldest year in the northern hemisphere since CE 1400."
http://en.wikipedia.org/wiki/Mount_Tambora#Aftermath
SECTION II: Global Temperature Fluctuation
Though dinosaurs got extinct 65 million years ago, namely between Cretaceous period and Paleocene, the world temperature does not look like having undergone a great fall in the period so as to wipe away dinosaurs.
If you look at the above figure alone, you would think that dinosaurs continued to prosper till the end of the Eocene Epoch that lasted from about 56 to 34 million years ago. But, they disappeared from the earth 30 million years earlier.
Indeed if a global cooling period had continued only for 100 years around 65 million years ago, it would not appear in the above graph. But, it is a period long enough to maker it impossible for any dinosaurs to leave offspring. After all the dinosaurs died down, the world temperature must have risen to a previous higher level again. Dinosaurs that had prevailed for 200 million years could be wiped away only a 100-year long cold period caused by volcanoes or meteors, since an average life time for dinosaurs was about 30 years.
From a different point of view, if mankind should get extinct in the 21st century, we might not leave any clues to why we should for future visitors to the earth from another solar system...
It is especially so, as I have calculated that the Second Coming of Christ already started in 2010.
http://eereporter.blogspot.com/2011/09/take-nothing-for-your-journey.html
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(Time, Time, Time, Is on Your Side...
http://www.youtube.com/watch?v=XzcWwmwChVE&feature=related)