You know when you start learning how to drive, and all you notice when you walk around are road signs? They've been there all your life, but you never noticed them. And now they're everywhere.
With the year drawing to a close, we're soon going to hear the much-dreaded question: "So, what are your New Year's resolutions?"
The next big win for the planet may not be a field of solar panels or a new emissions cap. It may well be people themselves, motivated to become better climate stewards than their neighbours down the block.