I had to laugh when I saw this sign in the shower at the airport in LAX. I am quite sceptical of the energy saving notices in commercial establishments when they relate to water. In this case it meant that the water pressure was so low it took three times as long to shower and wash the shampoo out of your hair so they would have been better providing normal pressure and getting you out of the shower faster.
Many of the places we have stayed have displayed a sign similar to this telling us that if we reuse our towel we will be saving the planet. I would be a lot more convinced if they also provided plugs in the sink. We have stayed in 20+ different accommodations in our travels and the ONLY places to consistently provide plugs in sinks were the homes of our families. In some places there was no plug in the kitchen sink, many either had no plug at all in the bathroom, or it leaked rapidly and was completely ineffectual.
In some places we had no option but to wash our clothes under running showers as they provided no washing facilities and no plugs in basins.
I will believe these signs are more than money saving gestures for the hotels when they do their bit by providing well sealed plugs in the basins.