Delegates from around the world are in Lima, Peru for the latest round of international climate talks, known as "COP20." The climate change conference is not getting a tremendous amount of media attention, but it's tremendously important. Mark speaks with Eliot Diringer of the Center for Climate and Energy Solutions about the big issues on the table, the big points of contention, and how these talks might move the needle towards an internationally binding climate accord. These talks are a big deal. Here's what you need to know about the diplomacy of it all.