That's the point. This is Obama scoring points with the most gullible parts of his base. If there was any chance of it actually mattering he wouldn't have done

That's the point. This is Obama scoring points with the most gullible parts of his base. If there was any chance of it actually mattering he wouldn't have done it. This is standard lame-duck presidential politics, making grandstanding moves that have no consensus to actually be carried out and leaving the messy details of actual politics to their successor and/or congress. Climate deals in particular have a history of meaningless promises like this that won't ever be implemented, going back at least to Kyoto (which was signed by Bill Clinton, to no effect) If anything, a signature on this deal without a plan for ratification and implementation is a defeat, an acknowledgement that real action isn't possible so symbolism will have to do.