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Natural World

Amazon rainforest could turn into grasslands

October 5, 2020 | Comment icon 6 comments

The Amazon rainforest could eventually disappear entirely. Image Credit: CC BY-SA 4.0 Jlwad
Scientists have warned that the Amazon is at a crucial tipping point that could see it turn into savannah.
There's no denying the impact that mankind has had on the Amazon basin - a vast region of South America containing more than 2 million square miles of tropical rainforest.

Over the last few decades, this diverse and critical biome has been gradually destroyed by deforestation, human construction projects and climate change.

Now scientists at the Stockholm Resilience Center have warned that much of the Amazon is now on the verge of permanently switching from rainforest to open savannah - a process that can take decades to happen but which is extremely difficult to reverse once it gets going.

Chief among the reasons for this is climate change which has brought about less rainfall and longer periods of dry, hot weather which in turn has brought lengthy droughts and more frequent wildfires.
According to the study, at least 40% of the Amazon is now at the tipping point at which it could exist as either rainforest or savannah and more is reaching this state all the time.

"As forests grow and spread across a region, this affects rainfall," said study lead author Arie Staal.

"Forests create their own rain because leaves give off water vapour and this falls as rain further downwind. Rainfall means fewer fires leading to even more forests."

If enough trees are lost however, the balance is tipped and the forest is no longer sustainable.

"Drier conditions make it harder for the forest to recover and increase the flammability of the ecosystem," said Staal.

"It is harder to return from the 'trap' caused by the feedback mechanism in which the open, grassy ecosystem is more flammable, and the fires, in turn, keep the ecosystem open."

Source: The Guardian | Comments (6)

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Recent comments on this story
Comment icon #1 Posted by zep73 1 year ago
The Amazon rainforest belongs to the world. If the Brazilians don't stop their destruction of that natural treasure trove very soon, the world should declare war on Brazil. To let them destroy it would be a disaster!
Comment icon #2 Posted by Seti42 1 year ago
Too many in power (notably, the leaders of both Brazil and the US) still think climate change is not a problem and doing something for future generations would mean not making all the money now. Unacceptable to those types of b******.
Comment icon #3 Posted by khol 1 year ago
This is a global issue and should be treated as such.For foriegn goverments to stand by and watch it happen is as much a crime as the deforestation itself. Thisan extemely fragile and wildlife diverse area. Its disgraceful from a global perspective to let this continue in any capacity
Comment icon #4 Posted by Jon the frog 1 year ago
Only way out is a better pandemic at this point...
Comment icon #5 Posted by HollyDolly 1 year ago
Jon the Frog, You hit the nail on the head.As my late father would say, too many people in the world. Of course Mother Nature can change things climate wise.Look at the ICE Age.Mankind didn't have factories, cars, plastic water bottles,etc. Too many people in those areas are deseprate and so they do something that only hurts them in the end.
Comment icon #6 Posted by tmcom 1 year ago
True the Arctic will get them.

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