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.
Or if you don’t have land, set up a community network for borrowing appliances and gifting stuff people are no longer using.
Or all of the above.