Is the weather changing?

In order to understand whether the climate of our planet is really changing, it is indispensable to study what happened in the past. Man has always had an anthropocentric vision of  natural events, and for this reason tends to give importance to the more recent facts that affect him directly, or the more catastrophic,  “extreme” events that are often seen as a “rule” or as signals of sudden changes. For this reason, every hot summer seems to be the “hottest recorded in the past years”, every cold winter, the coldest. We do not take into account that often, a great quantity of information that reaches us every day from the media can generate confusion: a particularly catastrophic event that takes place makes the attention towards analogous events rise,  so that after the passing of a particularly devastating hurricane, for example, the passage of all the other hurricanes are signalled. This may make us think that the number of hurricanes has increased, but is it really so? Has the number of violent manifestations really increased, or is it only their interaction with man that has increased, due to the increasing amount of anthropization in areas that once were uninhabited. As a result, the same data, the same succession of events are interpreted at times in a radically opposite manner by different researchers. In fact, some researchers see an increase in the concentration of greenhouse gases in the atmosphere as the cause of a global heating of the planet in the near future, while others hypothesize that on the contrary we could expect a new ice age. The only objective way to solve this doubt is to observe the series of data on the temperatures in various areas of the Earth, for a reasonably long period of time so that the normal fluctuations around the mean temperature do not influence the readings.
Apart from any personal subjective interpretation, only  if we use an analysis of the objective data, then  is it possible to understand if there are really some changes in the general climatic model, and what is the real trend of the various phenomena. For this type of study on the climate it is therefore indispensable to carry out an accurate analysis of the climatic and meteorological data collected over a period of time. Only by analyzing the series of historical data will we be able to state objectively if there really is a trend of an increase or a decrease in a phenomenon, or if instead it is only a matter of simple casual oscillations around the average. For this it is necessary to take data from a sufficiently long period of time. However, nature is used to changes. The geological and paleo-environmental data enable us to reconstruct climatic variations, even of a very remote past, and the history of the Earth offers numerous examples of climatic changes that were quite drastic and sudden. But, unfortunately, this is not a systematic and tidy collection, but rather a series of incomplete data that are available in a discontinuous manner in space and time. The analyzed time is the geological time, on a scale of millions and billions of years. In order to monitor the “finer” variations, instead, it is necessary to work on a period of time that is shorter than the geological time, but which however is longer than the life span of a human being, and with series of data collected with as much continuity as possible in the same region. Only this way, in fact, will it be possible to understand what are the trends and the changes taking place.
Unfortunately a systematic collection of climatic and meteorological data began only slightly over 200 years ago in Europe, and approximately 100 years ago in the United States, and in many Countries it still has not begun. This is precious information, however the observation periods are still too short to enable the construction of long term variation models. In other words, the analysis of a series of historical data still does not enable us to answer the crucial question: is the Earth’s climate really changing? Also  because the data of the past cannot  take into account one of the factors that is becoming increasingly important, year after year, in introducing possible modifications to the parameters that govern the climate of our planet : the influence of the constantly growing human population.

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