Clearly the goal of Earth Hour events is not to actually achieve any significant reduction in energy use or carbon emissions. The decline in electricity use during the hour is fairly small, and is offset in several ways. A single hour in an entire year is also an insignificant amount of time. The main purpose of the Earth Hour campaign is to raise awareness about climate change, to organize people, and to prompt action towards real structural change that can truly lead to a significant reduction in carbon emissions, and eventually to reductions in the carbon concentration in the atmosphere. The real question is whether or not it is accomplishing these goals.
There has been a lot of debate over statistics related to Earth Hour events which I think is rather specious, as it obviously misses the main point. Earth Hour is not a practical solution to the problem of climate change, nor is it intended to be. It is a form of protest and mass communication, similar to the 350 campaign in the lead up to Copenhagen. In terms of getting out the message, it appears to have been very successful in the past, and likely will be again this year. The event is widely publicized around the world. We see posters, newspaper articles, and extensive television coverage. Many cities and other local communities get involved in the events, and millions of individuals participate.
