Charles Moore (pictured), who edited Saturday's edition of the flagship show, accused the BBC of being 'biased'

The BBC has been accused of being biased on topics such as climate change and Brexit by its own Radio 4 guest editor.

Charles Moore, who edited Saturday's edition of the flagship show, accused the BBC of being 'biased' on climate change and promoting 'alarmism' about its consequences.

Mr Moore said he also faced 'obstacles' from within the corporation to getting science writer Lord Matthew Ridley onto the show.

The Conservative peer has said that the risks of climate change are 'greatly exaggerated' and that the BBC regularly gives airtime to 'doomsday cultists' who make over the top predictions, according to The Telegraph.

It comes as the 16-year-old Swedish climate activist Greta Thunberg will take the Today programme's guest editor chair on Monday.

Speaking on the programme yesterday, Mr Moore said the BBC had become a 'secular church' which had 'nationalised culture' and needed to be 'disestablished'.

The BBC has been accused of being biased on topics such as climate change and Brexit by its own Radio 4 guest editor (file image)

On the show he said: 'What I am objecting to is preaching.

'The BBC has decided to be a secular church and it preaches and tells us what we ought to think about things.

'So it tells us we shouldn't support Brexit and we should accept climate change alarmism and we have to all kowtow to the doctrines of diversity.'

It comes as the 16-year-old Swedish climate activist Greta Thunberg (pictured) will take the Today programme's guest editor chair on Monday

He added that he faces difficulty especially when it comes to the topic of climate change due to 'rulings and bureaucracy' and the fact that Roger Harabin, the environment editor is 'biased'.

Today host, Nick Robinson, defended his colleague Mr Harrabin saying he was 'a journalist' who 'reports what he thinks is true'.

During the programme, Lord Ridley appeared for the Global Warming Policy Foundation and argued that climate change could lead to a 'range of outcomes'.

He warned the BBC had allowed itself to be 'bullied' by climate activists.

BBC spokesperson said: 'Roger Harrabin has led the way in climate change reporting for 30 years. He has long recognised and reported upon the seriousness of the problem and his expertise is recognised with an honorary doctorate and visiting fellowships at Oxford and Cambridge.'