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The Paris climate agreements in 2015 set an ambitious (and necessary) objective of maintaining global temperatures at 1.5 degrees Celsius above pre-industrial temperatures. But a study says that we may have exceeded this threshold several years ago.
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Scientists from Western Australia Oceans Institute have studied the Caribbean sclerospons with long lifespan and created a chronology of ocean temperature dating from the 1700s.
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While the study claims that we exceeded 1.5 degrees Celsius in 2020, other scientists wonder if the data of a single part of the world are enough to capture the immense thermal complexity of our oceans.
Whatever your position climate change (It’s real, let’s move on), it is impossible to have missed the appeal for action almost odious to “prevent temperatures from exceeding 1.5 degrees Celsius compared to pre-industrial levels”. In recent years, the somewhat bureaucratic sentence has become a rallying cry for the climate concerned with the climate.
This ambitious target first surfaced after Paris Climate AgreementAnd describes a kind of climatic threshold – if we pass an average long -term increase in the temperature of 1.5 degrees Celsius, and we hold on these levels for several years, we will make serious damage to ourselves and our environment.
Well, an article from Western Australia Oceans Institute has bad news: the world may have exceeded this threshold Four years ago. Published in the journal Climate change of natureThe newspaper reaches this conclusion by an improbable path – analyzing six sclerotices, a sort of sea sponge This clings to the underwater caves in the ocean. These sponges are commonly studied by climatologists and are called “Natural archives“Because they grow so slowly. Like, a-fraction of a millimeter per year. This essentially allows them to lock climatic data in their limestone skeletons, not entirely unlike trees or ice nuclei.
By analyzing the strontium / calcium reports in these sponges, the team could effectively calculate water temperatures dating from 1700. The aqueous house of sponges in the Caribbean is also a plus, like the major ocean currents Do not take off and not deform the temperature readings. These data could be particularly useful, because the direct human measure of sea temperature only dates back 1850, when sailors plunged buckets into the ocean. This is why the intergovernmental panel on climate change (IPCC) uses 1850 and 1900 as a pre -industrial reference, According to the website Grist.
“The overview is that the global warming Clock discounts for emissions to minimize the risk of dangerous climate change were presented by at least a decade, “McCulloch, principal study of the study of the study, Associated Press. “Basically, time is exhausted.”
The study concludes that the world began to warm up about 80 years before IPCC estimates, and that we have already exceeded 1.7 degrees Celsius in 2020. It is a great moment “Woah, so true”, but some scientists are skeptical. One of these scientists, speak with Mechanicalsaid that “this supports the credulity of claiming that the instrumental file is false based on paleosponges of a region of the world … Honestly, it makes no sense for me. Other experts expressed want to see more data Before completely upsetting the climate goal of the IPCC, which say that the earth currently oscillates at a long -term temperature change 1,2 degrees Celsius.
Unfortunately, even if the sponges Assist in growing evidence that we are crossing this 1.5 degree threshold when we speak. In January, the hottest was the hottest, with 1.7 degrees above pre-industrial temperatures. According to New scientistThis means that we have been greater than 1.5 degrees of change for at least a year. This does not jump the long -term average on the 1.5 line, but it is certainly a sign that we get closer quickly.
Whatever the percentage, one thing is certain: climate change is a crisis of all hands on the deck. In order to save the planet for future habitability, humans Need to immediately reduce emissions – after all, sea sponges tell us.
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