Googled around and seems like Anthony Watts is a noted anti-environmentalist. His bread and butter seems to be disputing the validity of -any- study which shows significant impacts and threats to ecosystems and/or the biosphere from human activity.

Not saying that his criticisms are wrong, but it sounds like if anyone were going to wave off bad news about the GBR and say 'oh it's fine, don't worry,' it'd be him.