You said, "saving energy and separating the trash are better than using tumblers. They are more comfortable ways. If you use post-it to remind that ‘turn off the light’ or ‘turn off the fan.’, it is easy to save the energy. Also, If you buy a wastebasket designed easy to separate the trash, you might separate the trash easier than before you did." But it is your subjective opinions, not common ones. And it doesn 't have any relations with using reusable goods. It can be put into action simultaneously.