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I love that analogy. No, you're not going to personally save the world by reducing your carbon footprint. But you know what you are going to be? One leaf on a tree in a forest, making that little bit more oxygen that helps collectively make the world a better place.
And that's worth doing. Especially if you can encourage other people to be leaves too.
I will add that I grew up with rich kids, like kids of CEOs of corporations you would know well, and we also learned about carbon footprints from an early age. Most of the class did not score well, obviously. But every time a neglectful powerful person births a baby leftist educated by the greater community, we win.