Barack Obama hosts his first G20 political summit as president this week. As 20 major economies gather in Pittsburgh, some wonder: What happened to the G8?

The private conversation with Clinton began and ended on the future of energy--also the subject of President Barack Obama’s address to today’s United Nations summit on climate change. Clinton, hoping to lead the conversation on the global green future, stressed over and over that the politics of environmental action is not a matter of tree-hugging but of dollars and cents.

With their European road trip almost over, President Obama and the first lady are clearly a huge hit around the world and the Europeans are going to have to deal with it.