Amazon rainforest reaching tipping point, researchers say.
The Amazon rainforest is moving towards a "tipping point" where trees may die off en masse, say researchers.
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A study suggests the world's largest rainforest is losing its ability to bounce back from damage caused by droughts, fires and deforestation.
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Large swathes could become sparsely forested savannah, which is much less efficient than tropical forest at sucking carbon dioxide from the air.
The giant forest traps carbon that would otherwise add to global warming.
https://www.madrimasd.org/blogs/astrofisica/2021/10/28/134843#comments
But previous studies have shown that parts of the Amazon are now emitting more carbon dioxide than can be absorbed.
"The trees are losing health and could be approaching a tipping point - basically, a mass loss of trees," said Dr Chris Boulton of the University of Exeter.
http://isa-universities-in-crisis.isa-sociology.org/?p=759
The number of trees cut down in the Brazilian Amazon in January far exceeded deforestation for the same month last year, according to government satellite data.
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The area destroyed was five times larger than 2021, the highest January total since records began in 2015.
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Environmentalists accuse Brazil's President Jair Bolsonaro of allowing deforestation to accelerate.
Protecting the Amazon is essential if we are to tackle climate change.
Trees are felled for their wood as well as to clear spaces to plant crops to supply global food companies.
At the climate change summit COP26 in Glasgow last year, more than 100 governments promised to stop and reverse deforestation by 2030.
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The latest satellite data from Brazil's space agency Inpe again calls into question the Brazilian government's commitment to protecting its huge rainforest, say environmentalists.
"The new data yet again exposes how the government's actions contradict its greenwashing campaigns," explains Cristiane Mazzetti of Greenpeace Brazil.
http://lessemellesenfolie.free.fr/index.php?post/2011/11/28/13-spetembre-2011-autour-du-mont-Rose
Greenpeace are calling on supermarkets in the UK and elsewhere to drop suppliers who are involved in deforestation from their meat and dairy supply chains suppliers.
http://isa-universities-in-crisis.isa-sociology.org/?p=430
Deforestation totalled 430 square kilometres (166 square miles) in January - an area more than seven times the size of Manhattan, New York.
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Felling large numbers of trees at the start of the year is unusual because the rainy season usually stops loggers from accessing dense forest.
https://www.madrimasd.org/blogs/astrofisica/2013/03/13/132574#comments
Brazil's vast rainforest absorbs huge amounts of greenhouse gases from the atmosphere, acting as what's known as a carbon sink. But the more trees cut down, the less the forest can soak up emissions.
Helen Briggs - Environment correspondent
Tue, March 8, 2022, 10:19 AM·2 min read
Amazon
The Amazon contains between 90 and 140 billion metric tons of carbon
The Amazon rainforest is moving towards a "tipping point" where trees may die off en masse, say researchers.
http://lessemellesenfolie.free.fr/index.php?post/2011/11/27/21-juin-2011-Campagne-Pastr%C3%A9
A study suggests the world's largest rainforest is losing its ability to bounce back from damage caused by droughts, fires and deforestation.
Large swathes could become sparsely forested savannah, which is much less efficient than tropical forest at sucking carbon dioxide from the air.
The giant forest traps carbon that would otherwise add to global warming.
But previous studies have shown that parts of the Amazon are now emitting more carbon dioxide than can be absorbed.
https://marcotuliocobar.es.tl/CREMAS-EN-CONCACAF.htm
"The trees are losing health and could be approaching a tipping point - basically, a mass loss of trees," said Dr Chris Boulton of the University of Exeter.
The findings, based on three decades of satellite data, show alarming trends in the "health" of the Amazon rainforest.
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There are signs of a loss of resilience in more than 75% of the forest, with trees taking longer to recover from the effects of droughts largely driven by climate change as well as human impacts such as deforestation and fires.
A vicious cycle of damage could trigger "dieback", the scientists said.
And while it's not clear when that critical point might be reached, the implications for climate change, biodiversity and the local community would be "devastating".
Once the process begins they predict it could be a matter of decades before a "significant chunk" of the Amazon is transformed into savannah - a vastly different ecosystem made up of a mixture of grassland and trees.
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"The Amazon stores lots of carbon and all of that would be released into the atmosphere, which would then further contribute to increasing temperatures and have future effects on global mean temperatures," Dr Boulton said, adding that stopping deforestation would go some way to addressing the problem.
Around a fifth of the rainforest has already been lost, compared to pre-industrial levels, they said.
The research was carried out by the University of Exeter, the Potsdam Institute for Climate Impact Research (PIK) and Technical University of Munich.
"Deforestation and climate change are likely to be the main drivers of this decline," said Prof Niklas Boers of PIK and the Technical University of Munich.
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Commenting, Dr Bonnie Waring of the Grantham Institute - Climate Change and Environment, Imperial College London, said: "These latest findings are consistent with the accumulating evidence that the twin pressures of climate change and human exploitation of tropical forests are endangering the world's largest rainforest, which is home to one out of every 10 species known to science."
The findings, based on satellite data from 1991 to 2016, are published in the journal Nature Climate Change.
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