theSIGNAL SCIENCE
3 August 2026
"The Earth does not lie — but it does take patience to make it speak clearly."
NEWSBUSINESSTECHNOLOGYWORLDSCIENCECULTUREENVIRONMENTSPORT
Science

Earth Is Warming Faster — And We Can Prove It

A new Potsdam Institute study finds statistically significant proof that global warming has been accelerating since around 2015, reaching record rates.

Here is a number worth sitting with: 0.35°C per decade. That is how fast global average temperatures have been rising over the last ten years. It does not sound dramatic — until you compare it to the 0.

2°C per decade recorded between 1970 and 2015. The planet is warming roughly 75 percent faster than it was a generation ago, and scientists at the Potsdam Institute for Climate Impact Research (PIK) in Germany now have the statistical evidence to say so with confidence. The tricky part of proving acceleration is that climate data is full of "noise" — short-term temperature swings caused by natural events. El Niño, for example, releases enormous amounts of heat from the tropical Pacific into the atmosphere, pushing global temperatures higher for a year or two.

Volcanic eruptions do the opposite, sending reflective particles into the sky. Changes in solar activity add yet more wobble. To see past all of this, PIK researchers filtered out these known natural influences from five separate global temperature datasets, produced by NASA, NOAA, HadCRUT, Berkeley Earth, and the European ERA5 system. What remained was the underlying long-term signal — and it told a striking story.

The acceleration since 2015 showed up in every single dataset, with a statistical certainty of over 98 percent. That figure means the shift in warming rate is almost certainly real, not a quirk of random variation.

Photo: Jo Van de kerkhove / Unsplash
Heat haze rises over cracked, drought-stricken land as temperatures break records worldwide.
Discuss
  • Why is it important to remove natural influences like El Niño before analysing warming trends?
  • The study uses five different datasets. Why does agreement across all five make the finding more convincing?
  • Should governments act differently now that acceleration has been statistically confirmed, rather than just assumed?
Science

Uber and Lyft quietly reshaped city economies

In 2010, Uber existed in exactly one city. By 2019, it had rolled into hundreds. Researchers at Carnegie Mellon University and Oxford Saïd Business School tracked that expansion across 167 American metro areas — and found something surprising. GDP per capita rose after ride-hailing arrived. So did the number of temporary and seasonal jobs. Total employment? Barely a flicker. That gap is the real puzzle. More economic output, more flexible gig work, but no extra jobs overall.…
  • Does gig-economy growth make workers more free or more precarious?
∞
We can now demonstrate a strong and statistically significant acceleration of global warming since around 2015.
Grant Foster, statistician and co-author, Geophysical Research Letters
Science

Nanoparticles that blink forever

For decades, scientists assumed upconverting nanoparticles were stubbornly, permanently "on" — useless for the blinking-dependent microscopy that maps molecules. MIT chemist Sam Peng's lab just proved that assumption wrong. By carefully tuning the chemical composition of tiny 10-nanometre particles, the team coaxed them into blinking spontaneously and indefinitely under infrared light. No fading dyes. No finicky chemical buffers needed. The result, published July 27 in *Nature Nanotechnology*, is U-STORM — a microscopy platform reaching ångström-level precision, three orders of magnitude sharper than conventional fluorescent dyes.…
  • Should science routinely re-examine assumptions that have gone unchallenged for decades?
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theSIGNAL IN THE LAB
1VOCABULARY
accelerationstatistical certainty
underlyingrewireupconverting nanoparticles
spontaneouslyrobustness
2GRAMMAR FOCUS
Gerunds and infinitives — complex patterns (stop to do vs stop doing)
Some verbs change meaning depending on whether they are followed by a gerund or an infinitive — for example, 'stop doing' means you no longer do something, while 'stop to do' means you pause in order to do something. Similarly, 'remember doing' refers to a past action, while 'remember to do' means not forgetting a future task.
to filter · filtering · to ask · asking · to prove · proving · recording
  1. Scientists did not stop out natural influences from the data until they were confident the acceleration signal was real.
  2. The PIK researchers stopped the results against five separate datasets before publishing their findings.
  3. Climate scientists remember a warming rate of only 0.2°C per decade between 1970 and 2015 — a far slower pace than today.
  4. We must remember that El Niño and volcanic eruptions create short-term noise that can obscure long-term trends.
  5. Economists have stopped whether ride-hailing creates jobs and started focusing on how it rewires the labour market instead.
  6. MIT's Sam Peng stopped that upconverting nanoparticles were permanently 'on' once his lab observed spontaneous blinking.
3IDIOMS
Define each idiom in your own words. Then write one sentence of your own using one of the idioms.
  1. sit with (a number / an idea)
  2. keeping score
  3. barely a flicker
  4. quietly rewire
  5. rolled into
4CRITICAL THINKING
The nanoparticle study and the climate acceleration study both overturned assumptions that had stood unchallenged for years. What does this suggest about the relationship between scientific confidence and scientific progress — and is there a risk that certainty, once established, can actually slow discovery?
5CREATIVE · HEADLINES
Write a headline for the climate acceleration story in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
The three studies in this issue — on climate acceleration, ride-hailing economics, and nanoparticle microscopy — all reveal a gap between what we assumed and what the data actually shows. Choose one finding and argue whether its implications are being taken seriously enough by the people with the power to act on them.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong using words from the articles and your own knowledge.
  • warmer→→
  • uncertain→→
  • noticeable→→
  • flexible→→
  • changed→→
  • sharp→→
8SPEAKING
  1. What does 'noise' in scientific data tell us about how knowledge is built?
  2. Could GDP growth without new jobs ever be considered a success?
  3. Which industries are most threatened by ride-hailing's quiet economic rewiring?
  4. How might blinking nanoparticles change the way diseases are diagnosed?