The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Cities offer us powerful leverage on our most stubborn, wasteful practices. Long commutes in our cars, big power bills from our energy-hogging buildings, shopping trips to buy stuff that'll spend a few short months in our homes and long centuries in our landfills.

For carbon-neutral cities, there are things worth talking about in how our consumption patterns can change - sharing goods, etc. - but those are a fraction of the impacts of transportation and building energy use. If we need to choose priority actions, the most important things are to densify, provide transit, and green the buildings.

There are a lot of different ways of building a prosperous society, and some of them use much less energy than others. And it is possible and more practical to talk about rebuilding systems to use much less energy than it is to think about trying to meet greater demands of energy through clean energy alone.

People don't understand the tyranny of media. The few women that the media will allow in have to think about male approval and their own success - and their writing reflects that.

In an industry that celebrates personal sacrifice as a symbol of commitment, you might not consider 'making sure everyone gets home for dinner' to be a mark of success, but creating and maintaining that culture is one of the things I'm most proud of.

Being a brakeman is very physical, and success is mostly determined by how fast you can push a sled for about 30 meters.

All business success rests on something labeled a sale, which at least momentarily weds company and customer.