Scientists Warn We May Be on Track for 'Hothouse Earth'
In two recent studies, scientists have looked into the future and into the past to see what might happen to the global climate if we fail to curb greenhouse gas emissions in time. The results are frightening.
A study published Monday in Proceedings of the National Academy of Sciences examined how, once a certain threshold was crossed, feedback loops could push the planet's climate towards a "Hothouse Earth."
The researchers expressed uncertainty as to whether limiting warming to the Paris agreement's upper limit of 2 degrees Celsius above pre-industrial levels would be enough to halt the impacts of climate change, or if feedback loops already in motion would accelerate the process regardless.
"We note that the Earth has never in its history had a quasi-stable state that is around 2C warmer than the preindustrial and suggest that there is substantial risk that the system, itself, will 'want' to continue warming because of all of these other processes—even if we stop emissions," study author Katherine Richardson from the University of Copenhagen told The Guardian.
Some of those other processes include the release of methane from the thawing of the permafrost and the dieback of carbon sinks like the Amazon Rainforest.
When it comes to sea level rise, the scientists outlined how the melting of Greenland's ice could disrupt the Gulf Stream current, lifting sea levels and warming the Southern Ocean, which would in turn melt more ice in Antarctica.
A "Hothouse Earth" would be four degrees warmer than pre-industrial levels, and the path towards reaching it would most likely flood deltas, increase the intensity of coastal storms, and kill off coral reefs by the end of this century or sooner.
Currently, the Earth is around one degree Celsius warmer than pre-industrial levels, and that is already leading to more extreme impacts than would have been predicted, study author and executive director of the Stockholm Resilience Centre Johan Rockström told The Guardian.
"The heatwave we now have in Europe is not something that was expected with just 1C of warming," Rockström said. "Several positive feedback loops are already in operation, but they are still weak. We need studies to show when they might cause a runaway effect."
The paper concluded that to safely avoid a hothouse scenario, humans would have to change their relationship to the Earth.
"Collective human action is required to steer the Earth System away from a potential threshold and stabilize it in a habitable interglacial-like state. Such action entails stewardship of the entire Earth System—biosphere, climate and societies—and could include decarbonization of the global economy, enhancement of biosphere carbon sinks, behavioral changes, technological innovations, new governance arrangements, and transformed social values," the paper said.
Another paper published July 30 in Nature Geoscience looked millions of years into the past to see how hot an Earth with a carbon-dioxide-heavy atmosphere would really be.
The study used peat fossils to assess mid-level temperatures in the early Paleogene, 56 to 48 million years ago.
This was the period after the extinction of the dinosaurs that saw the rise of mammals, as well as atmospheric carbon dioxide levels of 1,000 parts per million, which is what they are predicted to reach by the end of this century if no action is taken, The Atlantic reported.
The study found that during that time, average temperatures in what are now the UK, Germany and New Zealand averaged 23 to 39 degrees Celsius, 10 to 15 degrees warmer than now.
"Europe would look like the Everglades and a heat wave like we're currently experiencing in Europe would be completely normal. That is, it would be the everyday climate," study author and University of Bristol geochemist David Naafs told The Atlantic.
Naafs and his colleagues tried to assess temperatures in the tropics as well, but the ancient lignite samples from India they found turned up temperatures too hot for their method to accurately measure.
"Some climate models suggest that the tropics just became a dead zone with temperatures over 50 degrees Celsius like in Africa and South America," Naafs told The Atlantic. "But we have no data so we don't know."
By Grayson Jaggers
The connection between the pandemic and our dietary habits is undeniable. The stress of isolation coupled with a struggling economy has caused many of us to seek comfort with our old friends: Big Mac, Tom Collins, Ben and Jerry. But overindulging in this kind of food and drink might not just be affecting your waistline, but could potentially put you at greater risk of illness by hindering your immune system.
- 15 Indigenous Crops to Boost Your Immune System and Celebrate ... ›
- 15 Supplements to Boost Your Immune System Right Now - EcoWatch ›
- Should I Exercise During the Coronavirus Pandemic? Experts ... ›
- The Immune System's Fight Against the Coronavirus - EcoWatch ›
EcoWatch Daily Newsletter
As the world continues to navigate the line between reopening and maintaining safety protocols to slow the spread of the coronavirus, rapid and accurate diagnostic screening remains critical to control the outbreak. New mobile-phone-based, self-administered COVID-19 tests being developed independently around the world could be a key breakthrough in making testing more widely available, especially in developing nations.
- FDA Approves First In-Home Test for Coronavirus - EcoWatch ›
- When Should You Get a COVID-19 or Antibody Test? - EcoWatch ›
- Trump Plans to End Federal Funding for COVID-19 Testing Sites ... ›
- Trump Insider Embeds Climate Denial Into Agency Reports ... ›
- Climate Denier Is Named to Leadership Role at NOAA - EcoWatch ›
New Jersey is one step closer to passing what environmental advocates say is the strongest anti-plastic legislation in the nation.
Did you know that nearly 30% of adults do, or will, suffer from a sleep condition at some point in their life? Anyone who has experienced disruptions in their sleep is familiar with the havoc that it can wreak on your body and mind. Lack of sleep, for one, can lead to anxiety and lethargy in the short-term. In the long-term, sleep deprivation can lead to obesity, diabetes, and cardiovascular disease.
Fortunately, there are proven natural supplements that can reduce insomnia and improve quality sleep for the better. CBD oil, in particular, has been scientifically proven to promote relaxing and fulfilling sleep. Best of all, CBD is non-addictive, widely available, and affordable for just about everyone to enjoy. For these very reasons, we have put together a comprehensive guide on the best CBD oil for sleep. Our goal is to provide objective, transparent information about CBD products so you are an informed buyer.