New York Times: Tony Dokoupil, a bright young journalist at MSNBC whos taken on the environment beat, has posed some tough questions about this blog in a video commentary calling for me to pull the plug on Dot Earth after seven and a half years and 2,612 posts. He says, among other things, that it has become a hobby blog. Yes, that got my attention. I posted a reply on the website there and have added it below. Some of his points resonate given that blogging on Dot Earth is implicitly a compromise that always...