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The world must be halved Greenhouse gas emissions before 2030 limit global warming to 1.5 degrees this century, warns today a new report by the Intergovernmental Panel on
The world must be halved Greenhouse gas emissions before 2030 limit global warming to 1.5 degrees this century, warns today a new report by the Intergovernmental Panel on changing of the climateor (IPCC).
Report drawn up after a week of meetings in an alpine town Interlaken (Switzerland) and summarizing all developed by IPCC experts since 2015, recalls that over the decade 2011-2020. the planet has already warmed up 1.1 degrees in relation to pre-industrial levels (1850-1900).
“Global surface temperatures have risen since 1970 at a faster rate than in any other 50-year period in the past two millennia,” warns the synthesis report, the sixth produced by the IPCC since its inception in 1988 and completing an eight-year learning cycle in which Paris Agreement.
Atmospheric concentrations carbon dioxide (the main greenhouse gas) were in 2019 the highest in the past two million years (410 parts per million), recalls a report indicating that 79% emissions come from industry, transport, energy consumption and construction.
At the current rate of emission reductions, IPCC scientists warn that this century is “likely” to reach 1.5 degrees of warming, a limit above which experts say the impacts of extreme weather events will be especially catastrophic.
The IPCC has calculated that if current emissions continue, global warming this century will be 3.2 degreesunsustainable growth, and even with current emissions reduction commitments that experts are calling for more, the average temperature increase will be 2.8 degrees.
Experts note that in the case of a huge global volcanic explosion (like the Indonesian volcano Tambora of 1815 which caused the so-called “year without summer” of 1816) this would “partially mask climate change” by lowering temperatures, but only “for one to three years”.
Height sea level, one of the effects global warming and a possible source of environmental and humanitarian catastrophes “inevitable over the next centuries or millennia,” warns a new IPCC report.
“Over the next 2,000 years, the mean sea level will rise by 2-3 meters if global warming is limited to 1.5 degrees, and will reach 2 and 6 meters if it does not exceed 2 degrees,” the message says.
In any case, “deep, rapid and sustainable” reductions in carbon dioxide and other greenhouse gases could slow this sea level rise, the 93-authored report emphasizes.
global mean sea level increased by 20 centimeters between 1901 and 2018, but growth is accelerating due to climate change: before the 1970s it was 1.3 millimeters per year, between 1971 and 2006 it rose to 1.9 millimeters per year, and from 2006 to 2018 it is already climbing to 3.7 millimeters per year.
The report also warns that with global warming of 2 to 3 degrees (which the world is heading towards if commitments to reduce global emissions are not increased), all the ice on Earth will almost completely melt. Greenland and the Western Arctic.
This could further contribute to sea level rise, highlights the IPCC report, which even predicts a catastrophic rise of 15 meters by 2300, although in this case the scientific evidence is not conclusive.
It points out that at the current rate of global warming, the current circulation in the Atlantic is likely to “suddenly collapse” before 2100, causing “abrupt changes in regional climate trends and having a huge impact on ecosystems and activities.” Human”.
(EFE)
Source: Aristegui Noticias
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