Runaway warming could create & # 039; Greenhouse Earth & # 039; state and make sea levels rise almost 200 FEET

The Earth could be decades away from a climate turning point that triggers a fugitive global warming and threatens the future of humanity, warned the scientists. The threshold will be reached when average global temperatures are only around 2ºC higher than in pre-industrial times

The Earth could be decades away from a climate turning point that triggers a fugitive global warming and threatens the future of humanity, warned the scientists.

The threshold will be reached when average global temperatures are only around 2ºC higher than in pre-industrial times, suggests new research. They are already 1C higher, and they are rising.

The feedback mechanisms that act "like a row of dominoes" will turn the world into a state of "uncontrollable climate change" by the "Greenhouse Earth".

In the long term, Hothouse Earth's climate will stabilize at a global average of 4C-5C above pre-industrial levels, the study shows.

The Earth could be decades away from a climate turning point that triggers a fugitive global warming and threatens the future of humanity, warned the scientists. The threshold will be reached when average global temperatures are only around 2ºC higher than in pre-industrial times

The Earth could be decades away from a climate turning point that triggers a fugitive global warming and threatens the future of humanity, warned the scientists. The threshold will be reached when average global temperatures are only around 2ºC higher than in pre-industrial times

If that happens, the fringes of the planet around the equator will become uninhabitable, with sea levels of up to 60 meters (197 feet) higher than those that threaten coastal cities today.

A Winter Earth would represent "serious risks to health, economies, political stability and, ultimately, the habitability of the planet for humans," international scientists wrote in the journal Proceedings of the National Academy of Sciences.

The research highlighted 10 feedback processes that were predicted to start around 2ºC from global warming.

The & # 39; inflection elements & # 39; could convert natural carbon storage systems or 'sinks & # 39; in powerful emitters of greenhouse gases.

Professor Johan Rockstrom, a leading member of the team at the University of Stockholm, Sweden, said: "These inflection elements can potentially act as a series of dominoes.

& # 39; Once one is pushed, it pushes the Earth towards another. It can be very difficult or impossible to prevent the entire row of dominoes from falling.

& # 39; Places on Earth will become uninhabitable if the Winter Earth becomes reality & # 39;.

Scientists have warned of a catastrophic climate change. The feedback mechanisms that act "like a row of dominoes" will turn the world into a state of "uncontrollable climate change" "Greenhouse Earth"

Scientists have warned of a catastrophic climate change. The feedback mechanisms that act "like a row of dominoes" will turn the world into a state of "uncontrollable climate change" "Greenhouse Earth"

Scientists have warned of a catastrophic climate change. The feedback mechanisms that act "like a row of dominoes" will turn the world into a state of "uncontrollable climate change" "Greenhouse Earth"

WHAT ARE THE MAIN GOALS OF THE PARIS CLIMATE AGREEMENT?

The Paris Agreement on Climate Change has four main objectives with respect to reducing emissions:

1) A long-term goal to keep the global average temperature rise well below 2 ° C above pre-industrial levels

2) Aim to limit the increase to 1.5 ° C, as this would significantly reduce the risks and impacts of climate change

3) Governments agreed on the need for global emissions to peak as soon as possible, recognizing that this will take more time for developing countries

4) To carry out rapid reductions thereafter according to the best available science

Source: European Commission

The hazards of the tipping point were identified as the thawing of permafrost, the release of methane trapped on the seabed, the weakening of carbon sinks in the land and ocean, the increase in carbon dioxide production by the oceanic bacteria, the retreat of the Amazonian forest, the covering of snow, the loss of Arctic summer sea ice, the reduction of Antarctic sea ice and the melting of polar ice sheets.

The scientists wrote: "Our analysis suggests that the Earth system may be approaching a planetary threshold that could enclose a fast and continuous path to much warmer conditions: the Earth of the Greenhouse.

"This path would be driven by strong, intrinsic and biogeophysical feedback that is difficult to influence by human actions, a path that could not be reversed, controlled or substantially slowed down.

Where such a threshold might be is uncertain, but it could be only decades ahead in a temperature rise of (around) 2 ° C above the pre-industry.

"Avoiding a greenhouse Earth would require" deep cuts "in greenhouse gas emissions, as well as concerted efforts to remove carbon dioxide from the atmosphere, preserving natural carbon sinks and using technology, said the researchers.

A Winter Earth would represent "serious risks to health, economies, political stability and, ultimately, the habitability of the planet for humans," international scientists wrote in the journal Proceedings of the National Academy of Sciences.

A Winter Earth would represent "serious risks to health, economies, political stability and, ultimately, the habitability of the planet for humans," international scientists wrote in the journal Proceedings of the National Academy of Sciences.

A Winter Earth would represent "serious risks to health, economies, political stability and, ultimately, the habitability of the planet for humans," international scientists wrote in the journal Proceedings of the National Academy of Sciences.

HOW MUCH WILL THE SEA LEVELS GO UP IN THE NEXT CENTURIES?

Global sea levels could rise to 1.2 meters (4 feet) by 2300, even if we meet the climate targets of Paris 2015, scientists warned.

The long-term change will be driven by a melting of Greenland to Antarctica that will be set to redraw the global coasts.

Sea level rise threatens cities from Shanghai to London, low-lying areas of Florida or Bangladesh, and entire nations such as the Maldives.

It is vital that we reduce emissions as soon as possible to avoid an even greater increase, said a team of researchers led by Germans in a new report.

By 2300, the report projected that sea levels would increase by 0.7-1.2 meters, even if almost 200 nations fully met the objectives of the Paris Agreement of 2015.

The objectives set by the agreements include reducing greenhouse gas emissions to net zero in the second half of this century.

Ocean levels will increase inexorably because industrial gases that trap heat already emitted will remain in the atmosphere, melting more ice, he said.

In addition, the water expands naturally as it heats above four degrees Celsius (39.2 ° F).

The report also found that every five years of delay beyond 2020 at the peak of global emissions would mean an extra 20 centimeters (8 inches) of sea level rise by 2,300.

"Sea level is often reported as a really slow process that can not be done much … but the next 30 years really matter", lead author, Dr. Matthias Mengel, Potsdam Institute for Research Climate Impact, in Potsdam, Germany. He told Reuters.

None of the nearly 200 governments that signed the Paris Accords are on track to keep their promises.

Commenting on the findings, weather researcher Dr. Phil Williamson of the University of East Anglia said: "In the context of the summer of 2018, this is definitely not a case of wolf crying, giving a false alarm. The wolves are now in sight.

Chris Rapley, a professor of climate science at University College London, said: "Previous research has shown that an increase in average global temperature of 11-12C would make more than half the area of ​​land currently occupied by humans uninhabitable. .

Then, a "fugitive" warming to a new and uncontrollable hot state would pose an existential threat to humanity and most of the existing species. "

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