Over half the world’s population now lives in cities, with more and more people moving to them every day. Urbanization is not a new issue – a search on Worldchanging for “transportation” in the “cities” topic area alone returns 277 articles. Yet, despite all that has been written about urbanization, smart planning, and bright green technology, there’s still much more to be documented.

This is especially true when you get into the intersection of policy, technology, environmental science and urban planning. At least, until now. Yesterday, EMBARQ, World Resources Institute’s Center for Sustainable Transport, launched TheCityFix, a blog dedicated to exploring these overlapping issues. (Note: I work at WRI.)

EMBARQ is not a PR firm. It’s a robust, research-oriented organization with centers and partners around the world; it has worked and continues to work in places like Istanbul, Bangalore, Curitiba, Mexico City, Mumbai, Porto Alegre, Shanghai, and Pune. EMBARQ’s staff includes urban planners, transport engineers, policy experts, environmental scientists, geographers and sociologists. TheCityFix is this accomplished group’s effort to weigh in on the issues affecting our cities.

I am a big fan of TheCityFix – and that’s not just because I work with Ethan and Rhys, the brains behind the project. The site dovetails nicely with Worldchanging’s “cities” section, bringing additional resources and intellectual firepower to the urgent topic of urbanization.

Some of the more interesting posts I’ve read are about two wheelers in Vietnam (there’s an amazing video!), the hidden cost of cars, questions about the role of technology in reducing global warming, and asthma in New York City.

I was just at the site today and noticed that Robin Chase, founder and former CEO of Zip Car, has just joined the blog as its newest contributor.

But don’t just take my word for it, check it out for yourself!