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The climate of the last two thousand years has not registered a global change in temperatures like the one that is being experienced during the twentieth century.
This is the main conclusion of an international study carried out within the framework of the Past Global Changes (Pages) project in which Professor Juan José Gómez Navarro, researcher in the area of ​​Earth Physics at the University of Murcia participates.
Nature magazine publishes this Wednesday an article detailing the main results of its research.
The work done for this research has consisted in the creation, interpretation and analysis of a new database of the temperature of the last two millennia obtained from the study of the footprints that the weather has left in nature;
for example, in tree rings or coral growth.
The data on which this study is based were made public and freely accessible through PAGES in 2017 and has been the source used to, through different statistical processes that guarantee that there can be no bias or errors, reach the conclusion that current global warming is an unprecedented phenomenon.
The importance of this study lies in the fact that it disarms the arguments of those who consider that the current climate changes have already occurred in previous moments of history and do not correspond to climate change but to specific anomalies.
"What certifies the analysis of the statistical data we have done is that certain periods such as those known as 'The Little Ice Age' of the seventeenth century happened, but not on a global scale and at the same time throughout the world," says Gómez Navarro, who explains that this period of lowering of temperatures occurred first in Europe and then elsewhere, but that with the temperature records it cannot be said that it was a global process like the current one.
The same happens with the period known as 'Medieval climatic anomaly', which took place around the year 1000. In that period it is known that there was an increase in temperatures above the usual and this event has served as an argument for who defend that the current high temperatures are another anomaly like those already lived throughout history and not a climate change.
The analysis of the data carried out by Gómez Navarro and the rest of the team's researchers would demonstrate that this phenomenon was not simultaneous in different parts of the planet, so it cannot be considered global.
"Until this large database of temperatures became public, historical weather data had only been studied locally; now we can analyze global spatial coherence, which shows that in the past it is true that there were hot and cold stages, but not simultaneously and this is another argument to invalidate those who defend that we are not facing global climate change, "says the researcher at the University of Murcia.
The article published today in the journal Nature is entitled 'No evidence for globally coherent warm and cold periods over the pre-industrial Common Era' and is signed as principal investigator by Rafael Neukom.
Source: Universidad de Murcia
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