When the California cap-and-trade program fully launches on January 1, 2013, it will create the second largest carbon market in the world. While cap-and-trade may be the most visible and perhaps most controversial part of California's climate strategy to reduce its greenhouse gas (GHG) emissions to 1990 levels by 2020, it is not the only -- or even the biggest -- piece of the puzzle. Cap-and-trade is but one puzzle piece among many that the state is pursuing, but it is a key piece since it can be expanded to make up for emissions reduction shortfalls from other strategies. Here are the main pieces of California's climate puzzle and how they fit together.

Read the full article in The Huffington Post