An exclusive Guardian survey of hundreds of the world's leading climate experts has found that:
The IPCC experts are, in short, the most informed people on the planet on climate. What they think matters. So the Guardian contacted every available lead author or review editor of all IPCC reports since 2018. Almost half replied – 380 out of 843, a very high response rate.
- 77% of respondents believe global temperatures will reach at least 2.5C above preindustrial levels, a devastating degree of heating;
- almost half – 42% – think it will be more than 3C;
- only 6% think the 1.5C limit will be achieved.
The task climate researchers have dedicated themselves to is to paint a picture of the possible worlds ahead. From experts in the atmosphere and oceans, energy and agriculture, economics and politics, the mood of almost all those the Guardian heard from was grim. And the future many painted was harrowing: famines, mass migration, conflict. "I find it infuriating, distressing, overwhelming," said one expert, who chose not to be named. "I'm relieved that I do not have children, knowing what the future holds," said another.
"Sometimes it is almost impossible not to feel hopeless and broken," says the climate scientist Ruth Cerezo-Mota. "After all the flooding, fires, and droughts of the last three years worldwide, all related to climate change, and after the fury of Hurricane Otis in Mexico, my country, I really thought governments were ready to listen to the science, to act in the people's best interest."
Instead, Cerezo-Mota expects the world to heat by a catastrophic 3C this century, soaring past the internationally agreed 1.5C target and delivering enormous suffering to billions of people. This is her optimistic view, she says.
Camille Parmesan, at the CNRS ecology centre in France, was on the point of giving up 15 years ago. "I had devoted my research life to [climate science] and it had not made a damn bit of difference," she said. "I started feeling [like], well, I love singing, maybe I'll become a nightclub singer."
She was inspired to continue by the dedication she saw in the young activists at the turbulent UN climate summit in Copenhagen 2009. "All these young people were so charged up, so impassioned. So I said I'll keep doing this, not for the politicians, but for you.
Climate change is our "unescapable reality", said Joeri Rogelj, at Imperial College London. "Running away from it is impossible and will only increase the challenges of dealing with the consequences and implementing solutions."
Henri Waisman, at the IDDRI policy research institute in France, said: "I regularly face moments of despair and guilt of not managing to make things change more rapidly, and these feelings have become even stronger since I became a father. But, in these moments, two things help me: remembering how much progress has happened since I started to work on the topic in 2005 and that every tenth of a degree matters a lot – this means it is still useful to continue the fight."
and more on the article
‘Hopeless and broken’: why the world’s top climate scientists are in despair
Exclusive: Survey of hundreds of experts reveals harrowing picture of future, but they warn climate fight must not be abandoned
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