The Earth Hour is used to bring awareness to power consumption and saving the planet. Issues such as global warming and viable sources of energy are touted during the Earth Hour. There should be one Earth Hour per month, at minimum, until humans figure out that our planet isn't expendable.
With the earths resources dwindling creating regular earth hours could help tremendously in saving the environment for very little effort on the part of citizens. Although I do believe that failure to obey official earth hours should be punished in taxes and fines only. With continued earth hours citizens would eventual become accustom to using less thus saving a large amount of resources in the long run.