More than a third of the Amazon rainforest is struggling to recover from drought, according to a new study that warns of a “critical slowing down” of this globally important ecosystem.
The signs of weakening resilience raise concerns that the world’s greatest tropical forest – and biggest terrestrial carbon sink – is degrading towards a point of no return.
It follows four supposedly “one-in-a-century” dry spells in less than 20 years, highlighting how a human-disrupted climate is putting unusually intense strains on trees and other plants, many of which are dying of dehydration.
In the past, the canopy of the South American tropical forest, which covers an area equivalent to about half of Europe, would shrink and expand in tandem with the annual dry and rainy seasons. It also had the capacity to bounce back from a single drought.
“The Amazon isn’t only a pair of lungs, but also the heart of the planet”
But in recent times, recoveries have become more sluggish because droughts are growing more intense in the south-east of the Amazon and more frequent in the north-west.
The new paper, published in Proceedings of the National Academy of Sciences, examines satellite images of vegetation activity from 2001 to 2019. Tens of thousands of pixels, each covering a 25-sq km (9.65-sq mile) area, were analysed on a month-by-month basis and correlated with local rainfall data.
The authors’ goal was to investigate how “the frequency, intensity, or duration of droughts contributes to stability loss of Amazon vegetation”.
They found 37% of the mature vegetation in the region exhibited a slowing-down trend. While the patterns varied from area to area, they concluded that the highly deforested and degraded south-eastern Amazon was most vulnerable to a “tipping event”: in other words, a calamitous decline of the tropical rainforest to a different, drier state.
And when he tried to feel the place with one of his legs he drew it quickly back because as soon as he touched it he was overcome by a cold shudder. He slid back into his former position. Other travelling salesmen live a life of luxury.
I ought to just try that with my boss, get kicked out on the spot. But who knows, maybe that would be the best thing for me. If I didn’t have my parents to think about I’d have given in my notice a long time ago, I’d have gone up to the boss and told him just what I think, tell him everything I would, let him know just what I feel. He’d fall right off his desk! And it’s a funny sort of business!
It was half past six and the hands were quietly moving forwards, it was even later than half past, more like quarter to seven. Had the alarm clock not rung? He could see from the bed that it had been set for four o’clock as it should have been; it certainly must have rung. Yes, but was it possible to quietly sleep through that furniture-rattling noise?
True, he had not slept peacefully, but probably all the more deeply because of that. What should he do now? The next train went at seven; if he were to catch that he would have to rush like mad and the collection of samples was still not packed, and he did not at all feel particularly fresh and lively.
And even if he did catch the train he would not avoid his boss’s anger as the office assistant would have been there to see the five o’clock train go, he would have put in his report about Gregor’s not being there a long time ago.
The office assistant was the boss’s man, spineless, and with no nderstanding. What about if he reported sick? But that would be extremely strained and suspicious as in fifteen years of service Gregor had never once yet been ill. His boss would certainly come round with the doctor from the medical insurance company, accuse his parents of having a lazy son, and accept the doctor.
Any claim as the doctor believed that no-one was ever ill but that many were workshy. And what’s more, would he have been entirely wrong in this case? Gregor did in fact, apart from excessive sleepiness after sleeping for so long, feel completely well and even felt much hungrier than usual. One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin.
“What happened to me? It was a dream. My room, a proper human”
Above it there hung a picture that he had recently cut out of an illustrated magazine and housed in a nice, gilded frame. It showed a lady fitted out with a fur hat and fur boa who sat upright, raising a heavy.
And only stopped when he began to feel a mild, dull pain there that he had never felt before. Doing business like this takes much more effort than doing your own business at home, and on top of that there’s the curse of travelling, worries about making train connections, bad and irregular food.