Putting on an accent, he mimicked the teen’s appearance at the UN climate action summit in September, saying: “How dare you. You have stolen my morning. You have stolen my airtime. I have no life. How dare you.”
On Friday, Greta shared a picture on Twitter of her in Vancouver, where she was attending the latest climate strike march.
The teenager captioned the picture “I reached the Pacific Ocean!”
It didn’t take long for Piers to comment on the snap, writing: “Congrats. Looks like you’re having a lot of fun despite we ghastly adults ruining your childhood. Will you be reaching school again any time soon?”
The presenter was quickly criticised by some, who accused him of “hating on a child”.
But Piers insisted this wasn’t the case, and that in actual fact, he found Greta’s passion “admirable”, adding that he “worried” about the activist.
“Oh, I don’t hate Greta at all,” he responded. “I find her passion admirable, albeit her rhetoric can be very hectoring & annoying.
“But I think she’s being used, and I worry about her more than her supporters seem to.”
Piers isn’t the only star to speak out against Greta, with Jeremy Clarkson recently branding her a ‘spoilt brat’
During her impassioned speech about climate change, the 16-year-old accused world leaders of ruining her childhood by forcing her to take on the responsibility of saving the planet, which didn’t go down well with the TV presenter.
In his column in The Sun, the Grand Tour host suggested Greta needs to think about everything that adults have done for her.
“How dare you sail to America on a carbon fibre yacht that you didn’t build which cost £15million, that you didn’t earn, and which has a back-up diesel engine that you didn’t mention,” he wrote.
“Pause for a moment to consider how soundly you sleep at night, knowing that adults are building and servicing and flying Sweden’s fighter planes to keep you safe.
“We gave you mobile phones and laptops and the internet. We created the social media you use every day and we run the banks that pay for it all.
“So how dare you stand there and lecture us, you spoilt brat.”