Weather variability. The concept meteorological climate is a dynamic concept that includes daily changes in the seasonal cycle time and smaller scale variations in atmospheric conditions that are measured in periods of 2 to 25 years. The long series of observations indicate something of a phenomenon that is repeated, with an uneven variation in the length. It is necessary to define the climatic variations of different length and breadth to decide what qualifies as fluctuations in the short or long term and which are part of the innate annual variability and thus deserve the title of oscillations.

Snowing en Málaga 3 de febrero 1954.

Only when a series of fluctuations move in one direction long enough and effective to modify other environmental parameters is justified to talk about climate change. So I will define the types of climate variation in excess of the minimum level variations.

Sequence of climatic variation: 1. Minor fluctuations carried out for 10 years. 2. Fluctuations operating in regular intervals of 30 to 100 years. These first two are included in the fluctuations can be observed in a lifetime. 3. Post glacial and History over 100 years. 4. Fluctuations over intervals of 300 to 1000 years. For example the Little Ice Age and others that affect glaciers and vegetation. 5. Ice Age 10,000 years. 6. Geologically younger, 1,000,000 years. 7. Geologically older, 100 million years.

This definition of climate fluctuation or obviously differs from the subjective evaluation of the common man on the street who has no knowledge, who is amazed that the quirks and vagaries of weather, or the old man who remembers how much has changed since the time he was a boy.

The constant flow of natural phenomena is almost impossible for a man to recognize them without the help of a long series of observations that are susceptible to statistical analysis. The real and significant climate changes occur in thousands or millions of years and the scale of the climate history is astronomical.

In the last 600,000,000 years ago the earth's climate on a global scale is usually much warmer than today.

In those days there was no ice near the poles, the polar seas were open and there was if you want glaciers in the highest mountain ranges.

Instead, temperate conditions prevail beyond the Arctic circle. There were cold aberrations in type 4 during the history of Earth.

The first two occurred makes 570,000,000 and 280,000,000 years respectively. The third began 3,000,000 years ago suffered a sequence of "spasm" short and relatively cool and warm violent known as "The Pleistocene Ice Age" (The duration of the Pleistocene epoch that is of the order of 3,000,000 years.)

This image of a planet warm and relatively ice-free applies perhaps 95% of the geologic past. Ice sheets are anomalous in this framework and its presence indicated "Ice Ages in its past and present." Several of the intervals produced ice glaciers in the North American continent and Europe.

The relative phases temperate interglacial conditions were comparable to those present and there is reason to believe that the climatic fluctuations of the first and second order of the historical era are nothing more than minor variations in the second half of the interglacial period, in other words; modern climates are even preferable to the Pleistocene epoch. The small-scale variations are of great practical importance to man and his dependence on the resources of the Earth, causing famine and plenty.

Snowfall disarticulate abnormal communication systems, and snow melt can contribute to flooding record, humid summers later influence on vacation and activities may impact on the hospitality industry. The fluctuations of the first order for several decades lead to the advance or recession of mountain glaciers or changes in the flow of streams and lake levels and slight changes in routes or paths of ocean currents with potential implications ranging from severe droughts to changes in the fauna.

East Africa had a drier period between 1898 and 1961 for example of what I had been in recent centuries. Similarly the heating of the waters around Greenland since early 1900 has driven a shift from the whaling economy herring fishing as the retreating arctic mammals and large schools of fish approaching. Climatic fluctuations have a major impact on economic productivity of the world like any other socio-political factor reflected in the equity markets or stock exchanges. The population has always accepted the alternations between good and bad years in spite of occasional dissatisfaction.

That the climate has influenced the course of history is controversial. Certainly climate change can have severe economic impact as one of several economic changes can contribute to political crises. However, the rise or decline of civilizations should be interpreted using the climatic history that is quite another matter. In the last 200,000 years, we had two ice ages, and within the Earth about 60,000 will freeze from future polar circles to the border with tropical and Ecuador.

Together these changes are linked to their own processes of the Earth as the cycle of carbon dioxide or CO2 and Methane or CH4. The atmospheric emission of carbon dioxide gas from the earth's crust in its cycle itself known by geologists as CO2 cycle is much greater than what man can give through the exploitation of industrial resources . This gas known as greenhouse gas is potentially the younger brother of CH4, the main component in more than 90% of natural gas, also known in the mining of coal mine gas is a gas produced by decomposing organic nature issuance by the deep ocean to the atmosphere is even many times that of CO2.

This article discusses the different orders in the changes of climate and the different characteristics of each change. However, knowing these data do not exclude to respect the environment, forests, waters and atmosphere, make responsible use of resources provided by nature to enjoy a unique environment that may not be repeated in years light away from our solar system.

Jesúsf