I thought this was a hoax the first time I saw this story. But apparently not. The man is becoming a parody of himself.
12ft.io link for those who cannot be arsed with the Indie: https://12ft.io/proxy?&q=https%3A%2F%2Fwww.independent.co.uk%2Fnews%2Fuk%2Fpolitics%2Flabour-green-climate-change-starmer-miliband-b2372012.html
Starmer knows that the right wing is going to accuse him of being too cosy with climate protesters, so he’s desperate to appear tough on “tree huggers”. I doubt these anonymously attributed comments are real.