A good question and something that Dani Rodrik (Harvard) has previously looked at. This time environmental economics blog and 26econ have joined forces to present a few slides on blogging trends.
The results are interesting. I account for 2 of the observations which is a little worrying given the total number of observations.
Globalisation and the environment get a honourable mention in the presentation as we previously placed environmental economics as the number 1 environmental economics blog.
TOP ENVIRONMENTAL ECONOMICS BLOGS [Globalisation and the environment].
All students of environmental economics are encouraged to check these sites out.
Here is the PDF presentation of the Schiff and Whitehead presentation.
Some Economics of Economics Blogs[PDF]
It will be interesting to see if this ever gets published. I must say I am a little dubious about the quality of the data ;-)