Age: Maybe I’m naive, but I’m feeling optimistic about the climate talks that started in Copenhagen on Monday. US President Barack Obama now plans to address the conference on its last day, which suggests that the White House expects real progress. It’s also encouraging to see developing countries – including China, the world’s largest emitter of carbon dioxide – agreeing, at least in principle, that they need to be part of the solution. Of course, if things go well in Copenhagen, …