When I wrote 'The World Is Flat,' I said the world is flat. Yeah, we're all connected. Facebook didn't exist; Twitter was a sound; the cloud was in the sky; 4G was a parking place; LinkedIn was a prison; applications were what you sent to college; and Skype, for most people, was a typo.

Natural gas emits only half the carbon dioxide of coal when burned, but if methane leaks when oil companies extract it from the ground in a sloppy manner - methane is far more potent a greenhouse gas than carbon dioxide - it can wipe out all the advantages of natural gas over coal.

When it comes to dealing with the world's climate and energy challenges, I have a simple rule: change America, change the world.

Thomas Friedman Quotes