DETROIT: GM is holding a series of online chats with environmental critics after it faced intense scrutiny from some activists following the recent launch of its "GMnext" blog and wiki. The online discussions will focus on topics such as corporate "greenwashing" and renewable fuels.

Communications executives at GM said they shut down some comments sections of the new blog after it was inundated by a large number of combative and "unconstructive" comments from environmental activist group Rainforest Action Network. ...