Karma yoga means acting with the well-being of others in our hearts, acting impeccably for the joy of doing without any expectation for a reward. Spiritual activism, the way we are thinking of it, is much the same, but the orientation is more specific. We are acting with the current condition of our whole world in our hearts: the condition of our mother earth, as well as all the beings that inhabit our planet.
And we are acting with the intention to be mindful of how our actions impact our planet and our collective consciousness. We are doing whatever we can to be aware of, and draw awareness to, the dire need for seeing clearly how our current culture is harming our world, and how each of us can change that step by step, word by word, thought by thought.