A third of global wildlife and tree species on a glidepath to ‘mass extinction’: scientific experts

Nearly 30 percent of the 138,374 species assessed by the International Union for the Conservation of Nature (IUCN) Red List are at risk of extinction, the global conservation body reported last Saturday.

A separate report published by Botanic Gardens Conservation International (BCGI) on Wednesday said that a third of the world’s tree species were also at risk of extinction and hundreds are on the brink of being wiped out. 

Craig Hilton-Taylor, the head of the IUCN’s Red List Unit said that habitat loss, overexploitation and illegal trade have hammered global wildlife populations for decades, and climate change is now kicking in as a direct threat.

Paul Smith, Secretary General Botanic Gardens Conservation International said that some 17,500 species of trees – 30 percent of the world’s total – are at risk of extinction and 440 species have fewer than 50 individual trees left in the wild, according to the BCGI  State of the World’s Trees report. The number of threatened tree species is double that of threatened mammals, birds amphibians and reptiles combined.  “Every tree species matters – to the millions of other species that depend on trees, and to people all over the world,” says Smith .

A new report says that almost a third of the world’s tree species are at risk of extinction. /Egor Bychkov

Oak trees, maple trees and ebonies are also greatly under threat. Thousands of varieties of trees in the world’s top six countries for tree-species diversity are also at risk of becoming completely extinct. The greatest single number is in Brazil, where 1,788 species are at risk. The other five countries are Indonesia, Malaysia, China, Colombia and Venezuela. 

The biggest threats to trees include crop production, timber logging and livestock farming. Climate change and extreme weather are also emerging threats. A minimum of at least 180 tree species are also directly under threat because of rising sea levels and severe weather, especially island species such as magnolias in the Caribbean. 


Q. Are we in or on the cusp of the sixth mass extinction?

A: If we look at extinctions every 100 years since 1500, there is a marked inflection starting in the 1900s. The trend is showing that we are 100 to 1,000 times higher than the “background”, or normal, extinction rates. I would certainly say that the red list status shows that we’re on the cusp of the sixth extinction event (in the last 500 million years.  

If the trends carry on going upward at that rate, we’ll be facing a major crisis soon.

Q: The Red List began in 1964. Has it changed much?

A: The initial list wasn’t really based on scientific criteria. It was more of a gut feel: “We think the species is under some degree of threat.” But as the list started to grow, we realized that we needed to make the list scientifically defensible. So, we took a big step back and asked: “What is it we are trying to measure?” 

The answer was quite simple: risk of extinction.

Arabian Oryx in Dubai, United Arab Emirates. /CFP

Q: Are there species that would have gone extinct without the Red List?

A: There are lots of species around the world that we would almost certainly have lost. The Red List process drew attention, for example, to the plight of the Arabian oryx and led to conservation efforts, taking the animals out of the wild, captive breeding, reintroductions. We’ve seen species very nearly extinct that are thriving now.

Q: Does the Red List make recommendations?

A: The Red List is not policy prescriptive. It’s really just a statement of fact; this is what the status of the species is. Then it’s up to the decision-makers to interpret that and decide what policies should be enacted.

Q: Do you ever come under pressure over the listings?

A: There is lots of lobbying. Surprisingly, it’s not so much about the up-listing to a higher threat level. For some high-profile charismatic species, if you want to down-list them because there have been successful conservation actions, we often get lobbied very, very hard not to do that. 

There’s real concern that if a species goes down a category, that conservation investment will stop. This is where the ‘green status’ will really help.

Q. What is the green status?

A:  After you’ve done the Red List assessment, what are you going to do about it? This is where we started talking about the green status. How do you measure whether your conservation actions are being successful? If we hadn’t done anything, where would it be now? If we stopped all conservation efforts now, what will happen to that species going forward? Those are the metrics in the green status process.

Polar bear. /CFP

Q: Couldn’t that lead to species conservation triage?

A: There’s a limited amount of funding available and a vast number of species. It does come down to some really harsh realities. You’re obligated to just let some species go extinct because we really can’t save them. 

But it’s not something we tackle head-on in the Red List process. We effectively pass the buck on to others to make those very hard decisions.

Q: Climate change is rarely cited as a driver of extinction. Why is that?

A: It is obvious for the polar bears because of the direct link between sea ice cover and global warming. But with other megafauna, it’s a lot harder to detect the impacts of climate change. 

There is evidence pointing to climate change for the increasing frequency and intensity of wildfires. But when experts record threats to a species, they may put ‘increased fire frequency,’ not climate change.  

The chytrid fungus is wiping out amphibians all around the world, and we are pretty sure that its emergence is very much linked to climate change. But with the evidence we have now, the category of threat is invasive species, not climate change. 

IUCN article source: CGTN, 06-Sep-2021 https://news.cgtn.com/news/2021-09-06/Wildlife-on-a-glidepath-to-mass-extinction-Red-List-chief-13ks58y7wm4/index.html

Read State of the Forests report here – https://www.bgci.org/wp/wp-content/uploads/2021/08/FINAL-GTAReportMedRes-1.pdf

BCGI article source: https://newseu.cgtn.com/news/2021-09-02/Nearly-a-third-of-the-world-s-trees-are-threatened-with-extinction–13cSA96lH44/index.html

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