Fellow Swede, Bjorn Ulvaeus describes the climate activist as a girl with "superpowers".

Member of hit pop group ABBA, Bjorn Ulvaeus, is backing 16-year-old Greta Thunberg by hitting back at the haters.

He has described his fellow Swede as a girl with "superpowers", asking those like US President Donald Trump and Piers Morgan who criticise her how can they stoop so low?

Ulvaeus answers his own question by saying "the lack of counter arguments" is obviously the reasoning.

In a video message he pays his respects to Greta, saying she has become a "populists nightmare".

Ulvaeus adds: "She is like a straightforward, stubborn and deeply reflective Pippi Longstocking".


Greta began her school strikes in relation to climate change outside the Swedish parliament in August.

At the 2019 UN climate action summit in September she gave an emotionally charged speech, accusing world leaders of ignoring the science behind the climate crisis.

She has effectively become the face for climate action across the globe.

"It's a monumental achievement to create a global movement form scratch in such a short time.

"The pressure from millions of young people wasn't there before. And we don't know exactly what it will lead to, only it will lead to something which wouldn't have happened had she not decided to school strike outside the Swedish parliament a little more than a year ago," added the ABBA musician.