Greta Thunberg: When Asperger's Becomes a "Superpower"

A Childhood That Changed Course at 11

Greta Thunberg was born on January 3, 2003, in Stockholm. From around age 9, she says she became intensely interested in climate change — after seeing images at school about ocean pollution and melting ice caps.

Two years later, at age 11, she went through a severe depressive episode, accompanied by anorexia for eight months, linked to what would later be described as eco-anxiety. It was in this context that several diagnoses came in: Asperger syndrome (a form of autism), obsessive-compulsive disorder (OCD), attention-deficit/hyperactivity disorder (ADHD), and selective mutism. Her younger sister, Beata, was also diagnosed with autism and ADHD — their mother, opera singer Malena Ernman, would go on to write an entire book about this period in the family's life.

"A Superpower, Under the Right Circumstances"

Greta Thunberg has never hidden or downplayed her diagnosis — if anything, she's turned it into a badge of honor. On April 2, 2019, World Autism Awareness Day, she posted on Twitter: "Proud to be on the spectrum." She has also said she considers her Asperger syndrome, under the right circumstances, to be a genuine superpower.

She has explained that her black-and-white way of thinking, rather than seeing things in shades of grey, helped her view the climate crisis with a clarity that many adults, caught up in compromise, seemed to have lost. Her ability to focus intensely on a single subject — a trait often associated with autism — is also, according to several analyses, one of the driving forces behind the sheer consistency of her activism.

A Sign, Alone, Outside the Swedish Parliament

On August 20, 2018, at age 15, Greta Thunberg sat alone outside the Swedish Parliament with a sign reading: "Skolstrejk för klimatet" — school strike for climate. The idea didn't come out of nowhere: she had been involved since the summer of 2018 with the local movement "Fossil Free Sweden," led by Bo Thorén.

What began as a solitary gesture became, within months, a global movement: Fridays for Future, present in more than 135 countries. On September 20, 2019, a coordinated global strike brought together an estimated 4 million people worldwide in a single day — what TIME magazine would go on to call the largest climate demonstration in human history.

"How Dare You" — The Speech That Left Its Mark

Between 2019 and 2020, Greta Thunberg addressed several parliaments — the British House of Commons in April 2019, the French National Assembly that same July. To reach the UN Climate Action Summit in New York without flying, she crossed the Atlantic on a zero-emissions sailboat, a journey of nearly two weeks.

It's her speech from September 23, 2019, at that same summit, that remains the most quoted: "How dare you," she repeated, accusing world leaders of having "stolen her dreams and her childhood."

Greta Thunberg's full speech at the UN, September 23, 2019 (source: UNICEF).

TIME's Person of the Year, at 16

In December 2019, Greta Thunberg became the youngest Person of the Year named by TIME magazine in the title's 92-year history. The magazine praised her for turning a vague, widely shared sense of unease into a genuine global movement for change. That same year, she was nominated for the Nobel Peace Prize, in recognition of the student mobilization she had sparked.

Rather than claiming the recognition for herself, she publicly insisted it belonged to the collective: in her view, the honor was shared by the entire Fridays for Future movement, not her alone.

The End of a Strike, Not of a Commitment

Every Friday, without major interruption, Greta Thunberg showed up outside the Swedish Parliament from 2018 to 2023. In June 2023, she announced the end of her weekly school strike right as she finished her final year of high school — she explained that continuing a standard course of study made it simply impossible to keep skipping school every Friday, without ever framing this step as giving up on the cause itself.

Five years of weekly strikes, which became a globally recognized symbol — yellow raincoat, braided pigtails, hand-painted sign — that directly helped push the climate issue to the top of the international political agenda.

Frequently Asked Questions

Sources: Wikipedia (FR); Britannica; Novethic; NPR, UN speech transcript (September 23, 2019); Le JDD (June 2023); La Presse (December 2019); TIME Magazine, Person of the Year 2019; Al Jazeera.