I’m staying in an undisclosed hotel in Denver. When I arrived, there was a door tag on my bed that asked me to "make a green choice”. Specifically, it offered me a $5 voucher to the hotel stores/restaurants for each day I forgo housekeeping services. Being somewhat of an environmentalist and not seeing a huge benefit in clean sheets every day, I went for it. As it turns out, forgoing housekeeping services also means that no one takes out your trash or replenishes your shampoo and toilet paper. In fact, the housekeepers don’t come to your room at all. Not sure what keeping the trash in the (unlined) basket for one more day does for the planet, but I bet these "green” tags save the hotel a lot of money.