This is the number we, and by we, I mean the planet earth, needs to get to in order to carry on. Sounds somewhat improbable, which is sad.
We're all sort of just sitting around watching the planet warm, debating the politics of it, while it just warms. I have no idea what the solution is, nor even a solid enough grasp of the problem. But I do know this, smart people think we're in trouble.
And that's kinda a scary thought, as we prepare to bring our little dude into the world.