Following on from my previous post, if I had to identify who was largely responsible in the Guardian for the increased difficulty in posting critical comments in the environment section, I would point the finger at Damian Carrington.
Carrington isn't just a plain environmental journalist, he has a wider remit at the Guardian. He was appointed by the Guardian in 2008 as environment website editor, as described here:
The Guardian confusingly tends to describe Carrington's job title as being "Head of Environment", which makes him sound as though he is the environment editor, but John Vidal actually has the latter job title. As I understand it, Carrington is in charge of the environment website operation, which will include him having jurisdiction over who comments on the site.
Carrington's previous employers were the BBC, New Scientist and the Financial Times. It's no surprise that the BBC and New Scientist would employ a Green activist journalist like him, but the Financial Times is a bit more of a surprise. There are definitely plenty of Greenies in the financial community, but I would have thought that the obvious lack of numeracy displayed in his article writing would make it tricky for him to be taken seriously by the readers of a financial newspaper.
The person who has announced the Guardian's appointment of Carrington in the above article is Ian Katz, who has now moved on from the Guardian to be the editor of the BBC's flagship news show "Newsnight". Given Katz's previous track record in promoting Greenery I suspect you won't see very much criticism of Greenery on Newsnight.