As explained in previous articles, the climate of our planet has never been static, warm periods have always alternated with cold periods, the Middle Ages in Europe the time was much milder, the glaciers were almost entirely absent and many people began to colonize new lands previously perennially covered by snow, mountains and cultivated new villages were born in Greenland. In 1300, however, the climate began to change again, the winters became more rigid and long, summers shorter and cooler, hence the start time of the PEG, which stands for Little Ice Age, which affected in particular the northern hemisphere between 1300 and 1850. The coldest ever was undoubtedly between 1500 and 1800, the chronicles tell us where the advance of glaciers in the mountains, the perennial ice in Greenland ice and the rivers and ports in several European cities, many people abandoned their lands in migrated north and south, all the same thing they did people who, in the hottest years of the Middle Ages, had moved to the mountains.
What are the causes that lead to a cooling Earth? Today it is possible for it to happen again? The causes that lead to cool the climate are different, the main suspects are without doubt the volcanoes, the Gulf Stream and the sun.
Volcanoes in the past have often changed quickly the climate, this is because the large volcanic eruptions in the stratosphere and transported in large quantities of ash and gas, making a filter to direct sunlight, because you no longer in large quantities on Earth for some time, leading to a marked temperature drop also. Volcanoes Tuba and Yellowstone in the past, covered with the ash from the entire globe in a few days huge clouds of ash into the stratosphere and came across the planet for many years in darkness fell, the earth's temperature dropped more than 6 degrees with many consequences on the climate. The largest volcano in the world is precisely what U.S. scientists say Yellowstone that would erupt later than 2076, of course, are only predictions, but the volcano is active and is continuing to accumulate energy and sooner or later will erupt. The second factor that can change the Earth's climate is the Gulf Stream, this comes in warm waters of the Gulf of Mexico and all along the Atlantic at great depths much going north until you get almost to Greenland, then divide into sections, one of them rises to the surface between Spain and France moderating a bit ' whole climate of Western Europe, while the rest of his current trip mitigating climate throughout the Northern Hemisphere. Some scientists are investigating a possible decrease of the Gulf Stream, according to some estimates this should stop within a few years bringing a cooling of 8-9 degrees in many regions of Europe, the cause would be attributable to the melting of glaciers, fresh water the melted ice would mixed with Mexican hot currents up to block them altogether. This theory has been revived by director Roland Emmerich, the film The Day After Tomorrow , film for obvious reasons, climate change came in a few days with all the necessary consequences, the reality seems totally ruled out a change so sudden, but even if there was an immediate stopping of current, the effects and any changes would very long time. The last element, but probably what interests us more is the sun, its energy is essential for life on Earth and without it, within a few days, there would be most any form of life on our planet. Fortunately, for another 5 billion years, our star will continue to enlighten us, but the intensity and energy that comes is not always constant in the past and this has created a cooling in Earth's climate, a solar cycle lasts 11 years , the first years are characterized by strong solar activity, while the sixth until the eleventh its strength has steadily decreased, to recover immediately with the start of the new. The cycle is finished 23rd in 2007 and since then the 24th was never able to be strong, the sky is still one of the weakest that has ever been recorded since 1700, ie when studying solar cycles; NASA expected to be very weak also the 25th cycle, so on earth for many years will be much less energy with many consequences on the climate. doing a little research one can easily see that the coldest decades of the last 300 years were found to be those in which solar activity was very low, while decades have been warmer those in which the solar activity was high. In the sixties, both hemispheres had very cold winters, so much so that for fifteen years, the world press wrote about a possible ice age in the years ahead, At that time as the solar activity was very low, then the scholars had calculated that the CO2 (according to many scientists today the major source of global warming) as well as many other industrial gases, dispersed into the atmosphere, do not allow rays Solar arriving in large quantities on earth, thus creating a cooling of the planet. In the 80 and 90 cycles instead of the sun was very intense and students overturned this theory at all, never thought that the sun could significantly affect our climate, the greenhouse effect since 2007, shows signs of crisis, the glaciers continue to melt it, but in many areas the climate is already changing, the Antarctic, for example, who has never had problems with melting of glaciers in recent years is continuing to grow. The 2009-2010 winter was particularly cold in many parts of Europe, between June and August in the Southern Hemisphere winter was very hard and is predicted as a hard winter in Europe and the United States. More and more scientists are abandoning the idea of \u200b\u200bGlobal Warning (greenhouse) and show more interest in the sun, perhaps the real culprit in almost all climate change, many of them have calculated that because of the solar minimum that will touch the next few years, from 2011 to 2020, the Earth face a much longer cold of the last thirty years.
As you can see many studies predict that in the near future, for many reasons, the climate is cool, certainly for some years the climate on climate mad dance, which heats up with each passing year, I remember the year hot was 1998, will continue to appear in newspapers and TV to support the business empire built in the last twenty years, then you will certainly return to yell at the impending frost. It is certainly necessary to stop the toxic agents of the industries, mainly responsible for many diseases in humans, with their poisons in recent years, many ecosystems have been deleted forever, but not must be given to man to blame for climate change, nature will always continue, thankfully, to do what they want willy-nilly and man can not do anything.
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