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Approaching critical global temperature thresholds

January 21, 2025 By EarthWise Leave a Comment

The globe is approaching critical temperature thresholds

The Paris Climate Agreement is a global treaty adopted in 2015 to combat climate change by limiting global warming to well below 2°C above pre-industrial levels, while striving to keep it below 1.5°C.  But according to recent research, the planet is quickly approaching these critical thresholds. 

An international research team led by scientists from Colorado State University, Stanford University, and ETH-Zurich in Switzerland combined insights from 10 global climate models, and – with the help of artificial intelligence – found that regional warming thresholds are likely to be reached faster than previously thought.

In fact, the researchers found that most land regions will likely surpass the critical 1.5°C threshold by 2040 or even earlier.  Additionally, several regions are on track to exceed the 3.0°C threshold by 2060.  Regions including Central Europe, the Mediterranean, South Asia, and parts of sub-Saharan Africa are expected to reach these thresholds faster. 

The research team relied on transfer learning, a cutting-edge machine learning technique that leverages pre-trained models to tackle new, related tasks.

The research, which was recently published in the journal Environmental Research Letters, found that 34 regions are likely to exceed 1.5°C of warming by 2040.  Of those 34 regions, 31 of them are expected to reach 2°C of warming by 2040, and 26 of these 34 regions are projected to surpass 3°C of warming by 2060.

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AI predicts that most of the world will see temperatures rise to 3C much faster than previously expected

Photo, posted February 23, 2011, courtesy of 2011 CIAT / Neil Palmer via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Is the Amazon rainforest nearing a tipping point?

March 12, 2024 By EarthWise Leave a Comment

Is the Amazon rainforest nearing a tipping point?

The Amazon rainforest is the largest rainforest in the world, covering more than 2.5 million square miles.  More than three million species live in the rainforest, which constitutes approximately 10% of the world’s known biodiversity.  The Amazon rainforest’s biodiversity is so rich that scientists are still discovering new species all the time. 

The Amazon rainforest absorbs huge amounts of carbon dioxide from Earth’s atmosphere, making it a key part of mitigating climate change.  But the amount of carbon dioxide absorbed by the Amazon rainforest today is 30% less than it was in the 1990s. 

Deforestation of the Amazon rainforest remains a major problem. Cattle ranching is the leading cause of deforestation, but industrial activities, such as the mining of oil and gas, copper, iron, and gold, are also to blame.

According to a new study recently published in the journal Nature, global warming may be interacting with regional rainfall and deforestation to accelerate forest loss in the Amazon.  In fact, it may be pushing the rainforest towards a partial or total collapse. 

The study, which was led by researchers from Federal University of Santa Catarina in Brazil and the University of Birmingham in the U.K., has identified the potential thresholds of these stressors, and highlighted how their combined effects could produce a tipping point for the Amazon rainforest. 

The findings are important because the Amazon rainforest plays a vital role in the global climate system.  By identifying the most important stressors on the rainforest environment, the researchers hope they can develop a plan to keep the Amazon rainforest resilient.

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Is the Amazon forest approaching a tipping point?

Photo, posted July 2, 2017, courtesy of Anna & Michal via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

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