Political commentator Calvin Robinson says if it was up to him Extinction Rebellion would be prescribed as a "terrorist organisation".
"Because what they always do is block access to emergency services," Mr Robinson told Sky News.
"Ambulances, fire engines, police cars cannot get by and people cannot get the help they need because Extinction Rebellion think they are more important.
"What’s disappointing about all of this is I’m a conservative, I would be in favour of protecting our world, protecting our environment.
"They could win people like me over to their argument but they don’t because they get so extreme – I don’t think they realise this."