The Labour leader, who has consistently attacked the teenage climate activist, shared an image of Greta next to a swatstika, which was the emblem of the Nazi party during World War Two. Its traditional red background was instead coloured green.
The attack came as part of a string of tweets he shared, attempting to “debunk” manmade climate change.
One part of the thread included a video of himself arguing with what he called “GretaGoons” in Bristol.
Around 15,000 people are believed to have attended the Youth Strike 4 Climate rally last week.
Ms Thunberg then gave a speech on College Green, before leading a march around the city.
But several people reacted negatively to the post.
Sky News host, Julie Hartley-Brewer, replied to Mr Corbyn: “I’m as opposed to the eco loons and the cult of Greta as anyone but it is just plain wrong for you to use a photo of her alongside a swastika.
“She is a child being used by the cultists.
“Please delete that tweet.”
He said: “Listening to an ignorant brainwashed child is deranged.
“I am an actual scientist of physics Meteorology, astrophysics and climate and say Greta Thunberg is wrong and suffers mental abuse by manipulative adults.”
During Extinction Rebellion’s take-over of Waterloo Bridge, Mr Corbyn staged a counter-protest, holding a banner calling Carbon Dioxide the “gas of life”.
Speaking at the scene, he said: “This is disrupting traffic and stopping people going to work, the police should have moved them on ages ago.”
Mr Corbyn also denies that Carbon Dioxide is a driving factor in global warming.
In a blog post from 2008, he claimed, instead, that “Global warming is over and it never was anything to do with CO2.
“CO2 is still rising but the world is now cooling and will continue to do so.”
As the owner of WeatherAction, Mr Corbyn claims to make weather forecasts up to a year in advance.
His weather predictions are based on the sun’s activity, and claims earthquakes can be triggered by the sun’s actions.
He has gone as far as to accuse the government of causing “suffering and deaths” which could be avoided if politicians stopped trying to reduce carbon dioxide emissions.
Published at Mon, 02 Mar 2020 00:34:00 +0000