That's right-the striking thing about greenhouse gases is the diversity of sources that emit them. A herd of cattle belching can be worse than highway full of hummers.

If e-mail had been around before the telephone was invented, people would have said, 'Hey, forget e-mail! With this new telephone invention I can actually talk to people!'.

Something really big happened in the world's wiring in the last decade, but it was obscured by the financial crisis and post-9/11. We went from a connected world to a hyperconnected world. I'm always struck that Facebook, Twitter, 4G, iPhones, iPads, high-speech broadband, ubiquitous wireless and Web-enabled cellphones, the cloud, Big Data, cellphone apps and Skype did not exist or were in their infancy a decade ago.

If you don't visit a bad neighborhood, it might visit you.

Obviously China is clearly taking the lead in some areas, but when it comes to the most advanced innovation, it's still America.

I'm from Minnesota. I'm optimistic. I mean, that's just who I am.

If you don't visit the bad neighborhoods, the bad neighborhoods are going to visit you.