The theme is that even a brief period of inaction — a mere 7 years — costs a lot. In makes the task much harder, and even then we can expect a sizeable amount more CO2 in the atmosphere when all the dust clears. It really drives home the point that although the distastrous phase of global warming may be decades away, every year counts, every ounce of prevention is worth a gigatonne of cure, and even a single more decade of inaction makes things dramatically worse.
I fully expect that soon — by the end of this decade — things will be so clear that even the Inhofes of this world will no longer have any political traction, the need for action will be so obvious. But as this RC post makes clear, we simply can’t afford to waste another decade.
Ordinarily I wouldn’t bother to point out an RC post because most readers here also regularly read RC. Even if I did, I’d just link to the post. But this is so important, I’d like to reproduce the post in its entirety. I’m confident that the RC authors are OK with this (it’s reproduced with fidelity), but if they request that I don’t then of course I’ll retract this re-posting.