I joined the Greens decades ago - for a lot of reasons, but because they (we) do not focus policies around financial approaches, as Labour and Tories do.
But it is about a focus on the world, on the environment, on how we can keep our planet running. Not how we can keep our financial systems running. As you say, it is a vote for the planet.
OK, we are socialist in terms of so many policies. But there is still a focus on how we can exist on this planet. that is a different focus, and one I can support.