Every other holiday was tied to one place, or some political or special event. This Day is tied to Earth itself, and to the place of Earth in the whole solar system. At this moment, when I climb the steps and ring the Peace Bell, it will be the Equinox in every part of the world, and we can all celebrate it at once on behalf of every part of the world. Earth Day avoids matters in which honest people disagree. While seeking a common cause it is important to do it honestly.
Spin doctors twist words to mean something different from what was intended.
Also, there is the problem of power. Most of us are media made. Our opinions and conduct are influenced by the paper we read and the TV or web programs we view. In all of this, big money or corporate and government power in a large measure decides what happens. Provide an Earth Trustee Media Blitz to save civilization.