This article was written by Joy Green in March 2008. We're republishing it here as part of our month-long editorial retrospective.

What happens when disruptive ideas combine?

This article was written by Jon Lebkowsky in March 2008. We're republishing it here as part of our month-long editorial retrospective.

This article was written by Alex Steffen in March 2008. We're republishing it here as part of our month-long editorial retrospective.

I've written before about my belief that in times like these, optimism is a powerful political act. As I put it in the book,

This article was written by Joel Makower in March 2008. We're republishing it here as part of our month-long editorial retrospective.

This article was written by Sanjay Khanna in March 2008. We're republishing it here as part of our month-long editorial retrospective.

This article was written by Alex Steffen in January 2008. We're republishing it here as part of our month-long editorial retrospective.

This is interesting:

This article was written by Alex Steffen in March 2008. We're republishing it here as part of our month-long editorial retrospective.

Here's a debate where none is needed: the argument about whether green building, compact communities, or transit-supportive design is a better approach to improving the world.

This article was written by Alex Steffen in March 2008. We're republishing it here as part of our month-long editorial retrospective.

To get a sense of how complex and tangled the task is of managing the planet, consider Chinook salmon.

This article was written by Saul Griffith in March 2008. We're republishing it here as part of our month-long editorial retrospective.

This article was written by Alex Steffen in January 2008. We're republishing it here as part of our month-long editorial retrospective.