Global warming: unprecedented current levels, due to man

Climate change is one of the biggest problems of this century and a new study – carried out by a team of researchers from the University of Arizona – showed how the current level of global warming is an unprecedented phenomenon , at least in the last 24.000 years. The study, published in Nature, led to the demonstration of three important facts:

  • It verified that the main drivers of climate change since the last ice age are attributable to the increase in greenhouse gas concentrations and the melting of ice caps.
  • Suggest a general warming trend over the past 10. 000 years, putting an end to a ten-year debate in the paleoclimatological community, or rather whether the trend of the period in which we live is towards an increase or decrease in temperatures.
  • The level and rate of heating in the last 150 years far exceeds the respective changes observed in the last years 24.000 years.

What emerges from the study – highlights the co-author Jessica Tierney (associate professor of the University of Arizona) – is that the impact of human activities is undeniable and has resulted in an unprecedented acceleration of the global warming trend , taking us very far from what can be considered normality.

In order to reconstruct the climate model of the last 24. 000 years, the team combined two independent data sets , that is the temperature of marine sediments and computer simulations of the climate, in order to have a more complete picture of the past. The analysis of marine sediments allowed to estimate the temperature level in the different eras based on the chemical elements present inside them (as residues of dead organisms due to climate change).

The computer-simulated climate models, on the other hand, provided information on the temperature based on the chemical analysis of meteorological phenomena; both of these approaches are not perfect and accurate to 100%, but the combination of the two observations is able to correct any inaccuracies of the single and allows you to have a complete picture , going to fish strengths of each of these approaches. For more details you can find the study in Source.

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